oh, thats a pretty cool game.
really enjoy the graphics and the smoothness of the gameplay. a few more small touches and this could be really great.
some feedback
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seems like just randomly going round and killing with no aim, having a kill count to show how many units you’ve killed or some score system might be nice. This’ll help measure your performance and add more replayablilty (so you aim to do better next time). Possibly throw a highscore system in to make it more competitive.
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Game just stops on the Game Over screen, maybe have a restart button to allow quick restart of the game.
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lack of sound reduces overall enjoyment of the game, having simple bullet and explosion sounds should make it much better.
again very nice job.