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I actually did go to the controls menu before playing (though showing them just in case might be a decent idea), but I think it's the presentation in your controls menu that needs some modification. You showed the left and right arrows and the letter A and D on top of them so I thought you meant that A and D "moves your ship left and right" rather than "A, D; and the arrow keys; move your ship left and right". I'd probably separate the A and left arrow into separate squares to show both keys are OK. Also are you thinking of perhaps showing a letter on the powerups like in Arkanoid? Since having to remember which colour is what is pretty difficult (although to be fair, you probably won't want to miss any powerup regardless of what it is). But at least now that I know arrow keys are supported it would solve that part of the concern.