This is a great compilation of 3 multidirectional run n gun vert shooters. Gun.Smoke, Commando and Mercs. There are a few features that are nice (for the time) such as ability to rebind keys and stuff like that.

Most people know commando, I hadn't heard of the previous two until recently. It includes some extra filler like little concept art galleries and some unlockable stuff that isnt really worth mentioning.

I would recommend looking at this if you feel nostalgic for old arcade games or like MAME type stuff. It's very much exactly how a re-release for such games should be. I played them with an included in game option for a vertical orienation (TATE mode) which was really cool and a lot of fun.

This is worth having imo. I'll have to take a look at the others, I believe I came across this while reading about Ghosts N' Goblins ports.