Cool concept. I liked how you had to plan ahead and anticipate what you should do. One criticism I have is that there is never really a lull in the bugs' spawns, so if you get overrun, you're never going to want to get out of attack mode and back into plant mode, since they won't stop coming. Especially if you get to a point where there are no fewer than 5 bugs on the screen.
But hey, game jam, not much time to fine tune balancing. Cool stuff altogether!