Nice
Nice game.
Just a few hints: add a background music (if possible, more than one so the player can choose)
the game gets pointless after 10 seconds.
try making diferent animations for each bug. cuz the ants seemed to be flying on the screen.
If u let lots of diferent bugs loose on the screen at the same, they could have some interaction, like the Spider eating the roaches, the ant pushing dead bugs around and the roaches eating any dead body they can get.
another possibility: create an anthole and a spider web, so they dont roam around too much.
and thats it.