Just use arrow keys or WASD to move around (keep in mind you're the green guy, his name's Leafer, you avoid the brown guy, Trunky) Press R to disable the falling leaf effect, press E to bring it back. Press Space to dash forward. Mobile mode is coming soon, and the BG is the name on purpose :) Plz enjoy.
I got most of the leaf images from Google, everything else I did myself. Story: Trunky has already wiped out all the leaves, and you, Leafer, are the last one. Avoid getting caught in the evil Trunky's plan to destroy your kind by dodging him for as long as you can.
