Edit 3 - haha
Okay, I RTFM - quick suggestion.
UP arrow isn't used, would suggest that , as you're playing with cursors, UP would be the collector, at the moment (maybe I'm just not that good at it yet) I get confused between scattershot and collector.
I reckon having them in different places I.E non-weapon on right hand, move/ collection , weapon ( space fire / hold for charging scatter shot ) could make things a little more intuitive.
Less is more as they say. :)
Really like what you've got so far graphics wise, and the music was nicely paced and not to overbearing.