For a long time you could easily kill insects just by spraying at them. I got a lot of feedback saying I should do it as a two step process. First incapacaitate the insect, then kill them. 

Finally I relented and made this change and the gameactually  became a lot more fun. Flies and spiders are now first ingulfed in a cloud of pesticide and are killed by jumping on them. Now I just need to update the rest of the enemy types.