This game feels and looks like a classic platformer. I really like the color palette you chose. :)
The gameplay itself, though, is where I take issue. The jump feels far too floaty; it makes me jumps feel overpowered and tedious at the same time. The map is also surprisingly pretty big. That's not a problem in an of itself, but when the gameplay is centered around finding the right switches to open the right doors, it can get a little frustrating if you don't find those things in the right order and have to backtrack.
I also don't really understand why you added enemies. Obstacles are fine, but these seem to exist to prolong the game's length. Some enemies are well placed; others are frustratingly placed.
Overall, I enjoyed the time I spent here. I don't know if I'll fully complete the game, but I liked it well enough.