It's a lot of fun!
Played it for like half an hour. Best run was around 8:30. Nice sense of progression with the enemies, although I think I might like a five-second break between waves every minute or so then instead of having to be on non-stop for long periods.
I'd really like a results screen when you finally get hit so I could be more specific about my best run.
Rotation speed seems like a mandatory upgrade compared to the others at the beginning so I feel like you might as well have it start at a higher level.
Does the pierce upgrade in the main menu do anything? I couldn't tell any difference after buying it.
Anyway, thanks for submitting.