Nice entry, this one's really tough! The horizontal movement is so much slower than expected for a platformer!
The pixel art is great, but I wasn't a fan of the sprite scaling; it really detracted from the "gameboy feel" for me. It also kind of bugged me that you could jump up to the first monkey throwing rocks, but you can't jump on them.
I didn't actually manage to beat it, but I might come back to this one and give it another shot. :)