Nice game :D
To give some feedback, I do think the game would benefit from killing the ants quicker, as it did take a lot to kill one. Maybe do a quick kill but have more ants spam. Then have the bigger kritters be more difficult to kill.
Also, the ants kinda stopped moving forward in front of me so they didnt seem too much of a threat. The big bugs i encountered sort of just appeared and then left :P
I do think the added weapons you can chose is a nice feature, but maybe changing the reload button to be the right/left mouse button would be better as it kinda hinks your movement to reload.
Overall, good job making this! :D