A random thought on the somewhat-contentious slipping mechanic: bullet time + zoom.
Bullet time gives the players more time to react, and zoom makes the required inputs clearer and gives a better indicator of what caused the slip.
Viewing post in Club Valentine jam comments
I didn't have trouble figuring out what would cause a slip, but maybe something like a partially transparent dark overlay behind the QTE inputs? It felt tricky a lot of the time to pick them out of the moving background, and having some contrast around them to make them stand out better seems like it might help with that!