i'd say you're off to a flying start, the game plays well. I only have one bit of small criticism, though.
When the player moves, he automatically aims in the direction he's moving. It makes it difficult to shoot at enemies when you're back-pedaling (which is 90% of the time in these kinds of games). If you could make it so that the player always aims at the cursor, it'd make it easier to control.
But like I said, great start!