Preliminary: As always I'm doing the original Japanese version (fan-translated). I'm super excited for this one. After the long, disappointing FF2 grind, I've been ready for an action game. And I've heard great things about this game. Plus the beginning jingle is good. Plus oh wow I swear this is the sprite my friends and I always used for our webcomics. Lol he sure does look happy when he jumps. And I'm already almost done with the Air Man stage, enjoying the tight controls and the feeling of already getting used to shooting at the exact right time to shoot those eggs before the birds drop them etc. I needed a good straightforward action platformer :-p Nice I'm glad they recognized how absolutely easy a password system would be for a game that just simply needs to know how many bosses have been defeated and thus which power-ups. And the tunes continue to be a jam! It seems, however, that the high difficulty I remember from the first Megaman is still there (this is the original Japanese version, mind you), and some damage seems unavoidable.
Day 2
The music is still absolutely incredible, each place so far! Loving the Quick Man stage's music right now. Good thing too, because the difficulty can be quite frustrating. I googled to be sure: yep, the North American "Difficult mode" is this version, the original Japanese version heh. My biggest complaint is the regular enemies just take too many hits, and from what I read, Easy Mode deals with that. I dig it. If only I could play that version >.> Haha. So far, though, with savestates it's far more doable than Megaman 1 which got very frustrating.
Like always I don't like when enemies respawn just cuz I go back a bit. Leave me alone! Haha. And the jump needed to be able to be upgraded higher or something cuz some of these enemies, with the amount of hits they take, it seems impossible not to have to take some damage... But regardless, I'm bobbing my head to the music and only 3 more bosses left before the Fortress boss rush.
Those guys who ride the leaping frog esque machines are so frustrating grrrr. And ugh six Fortress stages this time?! At least the fortress is beautiful (see below) and it becomes a sort of world map! (I would sorta compare the world map aspect to the last world of Mario 3 which was released a few months before this) 
The first fortress level music is so good! Thank goodness for the good music cuz these bird enemies and lots of the enemy mechanics and antics of having to use up your Item 1-3 energy frustrates the heck out of me.
Dang Dr. Wily needs to get his water checked.
Oh and this is what I mean about the world map aspect
Truth is, I was only having fun thanks to copious use of savestates. And I really wish I had the Easy Mode where the enemies take fewer hits. The difficulty really bogs down the fun. I guess I'm just not an early Megaman guy. That being said, the music is great, the sprites and characters nostalgic, it's technically well-made just very difficult, and I still was hooked to it. So by no means a bad game, just too difficult for me. I left off at Wily Fortress 5, so I should for sure finish it tomorrow! But for now it's movie and sleep time.
Day 3
I was hoping for some new tunes in the final 2 stages with Dr. Wily directly there. The Boss Rush was done better this time, and it seems that became the new norm (choose teleporters to go to each) for the series. I wish the teleporters were marked (are they?)... and this game is just way too hard for me to claim I enjoy it. I had to use a Continue to replenish my special weapons and a ridiculous number of savestate abuses. However, I did like the concept and format of the final fortress stage, the red acid dripping was difficult but I was able to learn it and avoid it without it feeling overly hard or tacky.
Wow okay but only one weapon works on the final Dr. Wily boss.... now that is tacky heh. I'm not doing another Continue to replenish. I'm cheating at this point. Not a good sign that I wasn't willing to play back through these few fortress stages, but also a good sign that I didn't just rage quit right then and there. And thank goodness for strategywiki to specify which weapon works... I'd be grumpy having to test each one. I know I know, this is how they encouraged replayability back then, but with the already existing high difficulty and way too many hitpoints for regular enemies to fall (again, this is the original Japanese version, so the Difficult Mode for NA version), just no.
This boss is obnoxiously hard. Your jump is just way too limited. There should've been more upgrades. Maybe I should try the Items, but who has time for that when his damage does an insane amount each time and his projectiles (which are an incredibly lame graphic) look a lot like the stars in the bland background? I tried to get a screenshot to joke "Play Find the High-Damage Projectile" but the projectiles are super fast-paced so I couldn't get one. One positive I learned tho, at least he shoots the fast projectiles at seemingly set intervals so once I got used to those, I just knew to always move/jump right then.... But also trying to time that with the odd Bubble arch was a lot. Thanks to savestates, at last I beat it
Nice even tho there wasn't a sweet final boss/final stages change of tunes, the final credits screen had a nice tune. and great Look. 
It went through all the different boss themes (that one above is Wood Man's/the Leaf Shield) and then ended with this nice dramatic screen 
Look: 8/10 This gets a bit of a boost from my nostalgia for early 2000s webcomics. (not even sure if it was specifically this Megaman, but that's what came to mind). Plus, great ending screens and level settings. For the most part though, just functional and good.
Sound: 8.5/10 Some really great jams. Nothing quite spectacular or sentimental though, but bordering on C64 quality music. Very high quality for NES, that is.
Play: 7/10 I can't deny I got hooked to the classic action platforming, but it also was way too hard and I had to resort to borderline cheating with savestates. I wonder if I would enjoy the NA Easy Mode more.
Feel: 7.5/10 Great Look and Sound, and the usual action platformer hook, contribute to a great Feel. However, frustrating regular enemy mechanics and respawning mean it can't be that cozy 8+ Feel I look for.
Attachment: 7.5/10 Again, I can't deny the Sound and nostalgia and technically high-quality gameplay (controls were responsive, only a few instances of sprite flicker, etc.), so I give this a slight boost. But how often I will want to replay this era of Megaman games is questionable. Maybe the NA release, so really this maybe should be an 8 for Attachment. I will boost it if I do end up satisfying that itch to try the Easy Mode version to see if I enjoy the Play more that way.
Overall: 7.7/10
Completion: Main Story