Controls:

Switch palette: Left Shift

D-Pad: Arrow keys / WASD

Button A: X / J

Button B: C / K

In this game, you play as a mushroom kicking and blowing up things. Yeah its pretty straightforward. Terrorist mushroom destroys local ecosystem basically.

How does this fit the theme?

Multiple ways actually, all the enemies are plants (Yes those dragon looking things are actually "dragonfruits". Complaints should be sent to Fartfish, not me), you "plant" bombs onto enemies and the wall on level 3 is covered with plants