The overall concept and UI are really cool, and they fit together very well. The game also feels quite polished.
I especially enjoyed the boss rush sections — they were exciting and intense. That said, my wrist was already complaining before Hard Mode. Maybe I'm just not much of an FPS player?
I can definitely see this working well on Steam. It's genuinely fun, but I think it could use some way to reduce the physical strain a little. As the bugs get faster and faster, you have to constantly track them and click very rapidly, which can become tiring after a while.