Yeah, sorry about that! A “practice session” before each game similar to in the Rhythm Heaven games was planned, but we didn’t have enough time for it. At the very least a controls screen would’ve been nice, but there wasn’t enough time for that, either! (The v1.0.0 release was made just a few minutes before the deadline…)
I made a wiki page for controls, but I know I can’t expect that to be good enough and I really hope I can add practice for version 2 :)