A really polished and fun platformer. I like how you varied environments a lot to keep player's on their toes. We've all seen games that have ice worlds and sandpits, but never usually side by side!
My only complaint is that it was a little bit difficult! I kept dying and being sent back to the start of the level. I assume old-school challenge was part of the appeal, but maybe some optional checkpoints could help!
Really fun!