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Please allow semi-automatic fire (keep firing if Z is held down). Also, currently there is no reason to ever not have the ball shield on (other than a tired finger) -- so either leave it on or don't let the player fire while it is on.
You should let the ball hit the enemies, but rather than necessarily damaging them, maybe have the ball affect enemies it hits in different ways (based on the enemy): EMP (no firing for a while), warp to earlier (open) position, or kill... Just as some possibilities. You could add poison or armour damaging, if you give the enemies HP/armour.
Gah! You were never supposed to be able to fire with the shield up, that was a last minute bug that i didn't notice, thanks for pointing it out. It's fixed now. Appreciate the other feedback as well.
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I have a few suggestions on how to make these completely separate game mechanics more integrated with each other. First, make it so that the Pong ball is your primary method of attack. Make the waves so ridiculously large and fast that it would be impossible to take them down with an ordinary gun, thus justifying the use of this giant energy ball which can steamroll through enemies effortlessly. And second, get rid of the shield, and replace it with a gun that shoots paddle-sized ammo, which you can use to bounce the ball and destroy enemies (but make sure to limit the gun's rate of fire so that it's not as destructive as the ball).
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Well, it's an interesting concept... but unfortunately, rather than feeling like a fusion of two games, it just feels like you're playing two completely separate games at once. The Pong ball just passes through the Invaders harmlessly, so I'm just left questioning why you're even bouncing this ball around in the first place. Plus, having to constantly hold down a key to keep your bouncer shield on gets rather tiring.