Wow, pretty cool game. Very impressive. Where did you come from? heh. Here are some notes:
Instructions need to be found in-game. Perhaps have a Help screen. Much of the information on your website would be good in the game somewhere, like the weapon descriptions and controls. The menu screens could use some more info too, like showing somewhere "Use +/- to change screens," or just have some clickable left/right arrows at the corners of the screens. I was not sure where to click on some screens. To select a weapon to upgrade, you click the weapon name, but I kept trying to click above or below the blue dot to select a laser color. Then on the Item Selection screen you do need to click above and below the blue dots.... All of this took me some time to figure out. I think you need to have like "empty circles" where you need to click, and when you click one, then the blue dot fills in the circle. Make that standard for all selections and it's less confusing.
I could not tell how much Radar costs.... And Reactor Storage Max upgrades seem to be completely free. When you're on the upgrade screen, it should show how many credits you have available.
The game could really use an onscreen crosshair. The nunchuck turning seems a bit too sensitive. The Laser really needs to be able to change spectrum without needing to go back to the menu -- perhaps have each direction on the d-pad select a different color, or just cycle them.