Hey! Interesting game, I like the rising water level adding lots of intensity! Small critiques: controls felt a little slow / odd inside the level design, like the characters were getting stuck / floating on the rocks and walls, i feel like there are maybe some misplaced colliders? I think looking into the basics of how to make a platformer feel clean / polished would help a lot!
I would highly recommend, next time, to see if you can integrate a tutorial into the game itself! I was very confused at first not knowing I could switch forms, since it wasn't in the game itself and only realized after coming back to this page to leave a rating. Its important that your game can teach the player how to play~
The mis-matched art is interesting! Maybe multiple artists worked on different tasks? Love the character animations, and the tile sets and pixel art is nice as well, though the contrast between styles is a little jarring. Fun idea though!