Dude, it sucks. Get over it.
Heres the thing. Congrats to bushy99 for being successful at the game. But from what I can see, you've built a game that is entertaining to about 10% of people who play it... But for the other 90% of people who play this game that you choose to ignore, let me set the record straight
The first wave is in fact too difficult
The graphics are not good
The auto shoot is garbage. the gun simply does not fire fast enough
The enemies come out too quickly and have too high a movement speed
Wave one is supposed to teach you the controls and feel of the game. Not dominate 90% of the people who play it.
I really hope you stop blowing these people off and start taking something meaningful out of their reviews.