The visuals and sounds of your game are amazing. Was able to survive some waves until the little space critters overwhelmed me.
Two suggestions come to my mind:
- Maybe I was playing to many KSP, but I just couldn't get used to the controls. I was constantly trying to orientate (A/D) and thrust (W) to move forward
- Getting a level-up for your weapon (spread fire or EMPs or something) after each wave would have raised the fun bar even more