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Top down shooters are a very competitive genre. You'll need to add much more enemies and much more features. Basically put more effort in------------------------------------
Sorry, but I found the gameplay really predicatable and really lacking on this one. It infuriated me that sometimes where my bullets went right through the enemies. It looks like you spent very little time on the graphics- you could learn well from a game of Pixel Purge. Also flooding the entire world with the same enemy until the player could no longer move, just represents bad game design to me. Next time, please make sure you submit something that you yourself would enjoy playing.
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1- Add a menu
2- More than 1 life!
3- Better graphic
4- autoshoot when you keep space pressed down
all those are not hard to do.