I like the general idea, but i find this game too hard, if i have to bee honest!! Maybe it's just me, but when a bug manages to get to the screen (even if I'm at full life) it means game over!!! Maybe clear the screen form the bugs and the glithces when a bug you lose a live (Yes, even if you kill an innocent feature: It could lead the player to make interesting choices)...
Also improving the feedback (expecially the audio one), would be nice: like, use hearts sprite instead of numbers to show the life counter and make a small sound when a bug hits the screen, or something like that!!!