The concept is cool and fun. The core mechanic of shooting feels right and the movement is enjoyable.
But the game does have some major problems.
1, The bugs shouldn't just spawn at a single location and then move twoard the player bur rater in a random location outside of a certain radius.
2. The green death effect is verry unoptimized and lowers the frame rate quite a bit if you kill enough bugs on screen.
3. When firing the gun, the muzzle flash is just a static 3d object. I suggest you set a random rotation everytime the muzzleflash is shown
I'd really like this game th evlolve into something bigger than this. I see potential in the Idea.