Okay fr I really love the little leafy man, he immediatly spoke to me when I saw that face in the thumbnail and it's adorable when he's doing a little wiggly dance in the middle of the screen lol
I don't even really know why, but his design is effortlessly cute and hilarious to me! :D
Same with the drooling little enemies! There's some real cool character design potential.
Another thing I liked is your interpretation of the theme. Leafy Man represents the environment, and the grey enemies are pollution, correct? But it also works the other way around - from his perspective, in a literal sense, the pollution is HIS environment.
Good job :]