So here are my suggestions:
First, despite being told to read the instructions, using control-click on Mac (I use a MacBook Pro) just isn't working for me. Using control-click pulls up a menu for me, so it either doesn't register the click in-game, or if it does, my shot is obscured by the menu and I can't see what I'm doing.
Second, I feel like there should be some system in place so you don't lose ALL your points every time you die. Like a bank or something that you can deposit your points in so they don't all get zapped. You'd still get zapped of all the points you have "on hand", but the ones in the bank would be safe, just like if you got mugged on the street or something, lol! But of course, something like that obviously isn't going to be available the first day of the game being out! :P
Also, the helmets are so cool, they need to be purchasable in the future!!
Other than that, GREAT job on this game so far!!! I'm really looking forward to seeing how this game develops!