in flaire's minigame if you enter skilltree and quit, this happens (shown in the screenshot).
the cursor gets replaced by ryen, who can't move and is stuck on the minigame board. this softlocks the game, and the only way out is forced teleport.
returning to flaire afterwards results in black screen, but the game still runs and minigame seems to function despite the black screen. if you manage to find the exit tile in the dark, you can actually exit, which seems to reset the minigame (or at least some variables) and restore normal gameplay
btw, great game. my first playthrough years ago took 70+ hours and the second one 100+. enjoyed every minute of it.