Really similar to Adventure Island 2, but i didn't enjoy this one as much honestly.
The main reason is the difficulty, and while it never reaches Adventure Island 1 level of cruelty (can't name many games that do though), once you get to 5-1, it is ON. From there, for my own sanity i just started using saves states.

Def an unpopular opinion, but Adventure Island 2 was just better, mostly because the later levels weren't designed by a fucking psychopath.
funny how easy that final boss is