This is very fun. I enjoyed the reverse-incentive upgrade system. I wish there had been more upgrades, so I'd be interested to see what an expanded version was like. I thought the sawblade surfing upgrade was particularly interesting because it had a pretty high risk factor associated with it. You want to drive into enemies but it might also disappear before you've cleared them all. The shaky camera was pretty uncomfortable but I think that could be cleared up with a bit of smoothing on it's tracking. I wish the roles of space and enter had been swapped. Since space was my main control I kept hitting it after a round was over expecting that to start the next round but instead it sent me back to the beginning.