i find it very difficult to loose when only having to defend the last remaining building. perhaps a multiplier for the number of remaining structures would level that out a bit. otherwise i don't see any point in defending all the other structures.
the physics are off and the q-ball has a lot more spin than the others. also, unlike real pool, the side pockets are easier to sink than the corners?!? would also benefit greatly if the player was able to set his own english.