I like the idea, and it was fun to choose between upgrades and have my attacks modified by them, though I do wish I had to wait a little less. It also felt like enemy health always scaled way quicker than my damage could, unless I got super lucky, so it ended up with me frequently just waiting for my attacks to kill for a solid minute or two. I still enjoyed my time, though, and the timer syncing up to the music was very satisfying to me.