Really nice game. The music and art fits well with the atmosphere. I managed to get 11 full grown trees before I got lost on the map :/
My feedback would be to limit the map size (I walked forever and couldn't find my way back to the enemies). I also got confused with all the circular shapes. Maybe the splatters should be a bit distorted, so there is a clear difference between bullets, enemies, seeds and enemy splatters.
But overall, I enjoyed playing your game.