Hey I played beta 0.4 and it was the best one so far..Just a few comments from playing 0.5, get rid of the the right click to shoot thing. It's extremely bothering, the left click was working and made the game way more fluid.
Also I am sure you are aware of the sound effects and the static they keep producing. I'm not sure if that's C2 or the actual sounds, but they need cleaning up. The best sound effect you have is the winning noise when you succeed in getting a ball in the whole.
Everything else about this game is entertaining and challenging, which is why I am critiquing it more harshly than I usually would because I actually like this game.