The reverted gravity mechanics is fun and frustrating at the same time. :-)
I liked the music and used sound effects, they fit well with the playful assets.
I managed to get to the third biom, and after several deaths, I gave up. It might be nice to add some checkpoints so player doesn't have to repeat from the very beggining.
Also - coins counter is not reset on death - not sure if it is bug or a feature. :-)
It is nice game.