The start menu has a cool automated crawler going, I liked that. Also the website links on the menu - very cool.
I liked the look of the plants and the somewhat voxle/rough polygon look of the walls and ramps, its nice art.
But this was a hard game :) Those darn plants get a whack in before I can turn to space-machete them. The fruit is delicious and plentiful, but I need more air!
Edit: Also, thanks for putting your code out on github!