Preliminary: Yesss on the 4th-ish level I got my favorite of the Dinosaurs. (Ugh the screenshot didn't capture it but it's the purple Lapras-type dinosaur I loved in the second Adventure Island) I liked the new Triceratops too. I lovvved the second Adventure Island and this is basically an extension of that. Some of the level design has been meh so far, and it doesn't have that excitement since I had already experienced this before, but can't deny it. I love it still
Sheesh that first area's boss was really easy lol. And I'm oddly liking the Blue Dragon type dinosaur the most this time rather than my usual beloved purple Lapras guy
Despite it being my "calm night" where I have to take breaks from gaming (I will I will) and that I have so many OSRS things I wanna do, as soon as I started this, I was intensely hooked like to an unhealthy degree where my neck tensed up and I put off getting up to pee lol. That's a good thing for the game, but is exactly why I implemented 2 nights a week where I set a timer and have to take breaks :-p Cuz if I did this all night and beat it in one night, it wouldn't be healthy! Anyway, I def have that platforming hook!
Welp I very well may beat this tonight even with the breaks lol. In my first 45 min gaming time, I got to the 5th Area :-p And based on my googling there are 7 in total. The level design and world map parts and music aren't as striking this time around, but it's still got that addictive gameplay formula from the second one that will make this surely a 4 star and likely a 5 star. (Oh wait there are 8 areas)
Day 1
Welp I'm back and almost to Area 7 lol. Smh. It's interesting how in the first one I absolutely overused the purple Lapras guy, but this time around I'm almost entirely using the Blue Dragon with a bit of the Triceratops which reminded me of Sonic and the Metroid Ball power. The level design still hasn't been stellar and the game itself hasn't presented anything new or exciting compared to its predecessor, except perhaps the neat Triceratops move, but still hooked! Oh and I got the Pterodactyl way less this time around, in fact so far I only got it in a Key-accessed "secret" power up area I stumbled upon.
I feel like Adventure Island II had level designs that encouraged and embraced the run/skate aspect of the early Adventure Islands more, while this one feels more inspired by the early levels of Sonic 1 where it keeps trying to gotcha so you can't ever just run for fun. (tho I did anyway lol)
As expected with NES platformers, the sprite collision masks are quite tight and the gameplay overall quite tight, compared to its Genesis and SNES full-sprite contemporaries that got a bit sloppy in favor of better music and Look. The downside, of course, is the NES limitations on music and sprite slowdown/flicker.
I kept telling myself I would stop so I could do calm OSRS playing for calm night but here I am on the last Area... smh lol
Yessss 
Day 2
I managed to stop playing last night to prioritize some calm time instead. I only have a bit left though. I got to the final boss with no dinosaur, and the 2 phases so far have been meh. Like the 2nd phase is so simple, just long.
The UFO sounds were annoying and for the most part the ending was shaping up to just be annoying, but a nice tune for the credits and nice colors for that too

Look: 7.5/10 I still love the dinosaur sprites but for the most part just rehashes of the prior game. And a second time around, a year later, it just isn't as special.
Sound: 7.5/10 Good tunes but not enough new spectacular ones to warrant the excitement the prior game gave me.
Play: 8.5/10 Still just love the Adventure Island II gameplay. I was thoroughly hooked. The level design was hit or miss, but still, I love the different dinosaurs capabilities even if I usually focus on just one or two each game, and I love the straightforward platforming.
Feel: 8.5/10 This probly would be a 7.5 or 8 if I didn't love the first one so much.
Attachment: 8/10 Ditto
Overall: 8/10
Completion: Main Story
Playtime: ~2 hours