Very mediocre... too random. The element of insanity is a nice idea, but it just doesn't work out fairly IMO. You can really get screwed even if you have the advantage if your opponent goes insane. Makes it really stupid when you're close to getting to the last rank and they hit you for some obscene amount due to megolomania. Could use custom deck making IMO so that you don't get stuck with bullshit cards.
control isn't precise enough and the game runs slow with any amount of enemies on screen even with the spawn cap set to 8, which actually does nothing to reduce the spawn cap. 4/5 still though as the game is addictive and fun.
This game is terrible. The difficulty goes up based on brute force not strategy. In the later levels you can hardly get any bubbles just due to the fact that the enemy has so many guys. 0/5 if I could.