Hmmm.. Good concept etc. but I think it should be made more clear why certain doors wont open and why they behave so erratically - those 4-way doors get uber confusing - 3/5
Pretty awesome - 4/5 I reckon some glitches could be fixed (or at least made so they're unlikely to happen) by having a smaller ball + I reckon a counter of how many blocks you used to complete it would be good
I got a pretty awesome combo that takes down most stuff - pack your slots with missile things (the ones that follow your mouse) and max out there reload time, then keep cycle round the numbers - basically unstoppable
Get a damage buffer or apocalypse cannon is you have trouble later