There are keys!
123: use item.
Space:play/pause.
Enter: start fight / end of replay / finish replay.
W/up: start of replay.
S/down: end of replay.
A/left: step back.
W/right: step forward.
You can break up a dancing pair
Yes. The weapons have different strike patterns similar to Crypt of the Necrodancer.
Please share any bugs you discover here.