Other than the game needing more polishing, I think the biggest problem is that the game is just way too hard, I'm not one to go against a developer's vision but, usually in a really hard game I expect that I can get good over time and start kicking asses in it and feeling cool, but in this game you only have very minimum room for improvement, and I don't expect anyone on the planet to have a score higher than 150, which means that for a game called endless chaos, no one will be able to play for more than 3 minutes. That is just not good for engagement for your game.