The visuals that are here are top notch, this is an expandable concept to be sure. I'd be careful how fast you up the fire rate in a later version, as if there had been 1 or 2 more levels i'm p sure my swearing would have crashed the game haha
The shield system felt a little unclear, i could get the little guys to stand in the road sometimes, but a lot of the others they refused to, all in all a great concept c: