Good game 4/5
Few notes for improvememt:
1. game is loosing interest after you finish. need some system for better calculating of high score as motivation. For example multificator (+ if you dont get hit every second/ - if you get hit)
2. Later in game is begining incredibly booring. Can be integrated some system of respawning (quicker you kill - respawn time is decreasing)
3. Need to be integrated some system of variation of creeps. Noe they are generated too "scripted". As I said before. Becoming boring.
You can earn one more star from me if you take some inspiration from game Pixel Purge.
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 "CrossFire Madness")
 "Enigmata: Stellar War")