Alright, so I can see the vision, multiple characters to solve numerous obstacles in a very hostile world. I feel like you kind of fumbled on the execution though.
Let's start on the gameplay, the beginning was kind of neat, getting the three characters and figuring out what they do, yeah, pretty cool. My main issue comes in after you get the wind guy, the rooms are just cruel and not fair. The character movement isn't very fine tuned in the first place, having to do precise jumps over pits of fire and avoiding enemy bullets is not a fun experience, expecially since a bit of knockback can kill you immediately by sending you into a fire pit with no escape.
The art was a bit odd, it felt like you mashed together a bunch of assets with different styles, which is weird to look at. The character, tile and background art were good by themselves, but they don't really fit when you combine them. For sound effects and music I think that they are very out of place, especially sound effects. The music is very calm, which adds a strange sense of comedy as you frustratingly throw yourself into a pool of acid over and over.
All in all, I didn't really like this game, but the idea has charm. If you were to redo this and improve upon all the critical points, I'm sure it'd be a pretty sweet game!