This game is the first I've seen that did the joining two players thing with a proper setting and fun gameplay. The level design is very smart and the music is quite fitting. The sfx when switching were also a nice touch. Art is really good too. However, one nitpick is that the goal for the level wasn't clear from the start so I didn't know what to do for a while. Also while the puzzle design is good, it might benefit from a bit of leniency as for the cannon that's shooting those sea-urching thingies. All in all, pretty fun game!