Thanks for the feedback and ideas!
As for bugs, I was wondering if you could make different enemy types based off the lifecycle of one species. For example, the larvae could be weak chaff, working their way up into carers, workers, soldiers, and ofc the queen.
I like this concept, I think fighting different kinds in a level would certainly help things feel less repetitive. The LRAD for a primary weapon also sounds unique, but I don't know if it'd be very satisfying to use as it wouldn't fire projectiles or a solid beam.