Great feedback, thank you! Multiverse chess does sound great, to be fair.
I think the releasing one step too late issue is to do with it completing a tween and snapping to the grid so pieces line up. Could fix this by assessing where the launcher is in it's tween and potentially move it back to snap at the start of that movement if the button is pressed in the first X amount of time. Will look into it! I likely adjust my pressing because I know that's what it's doing, so I didn't pick up on it as well as others would.
Great suggestion on the button prompt too, I'm adding that now. Will hopefully get it done in time and work on a better onboarding / tutorial at a later date.
Not sure why that main menu transition triggered, that's a fun one. Maybe it registered a click on screen where the play button is before it actually showed the button. Will add a slight delay to the scene before they're active, hopefully that fixes it.
Agreed on displaying the loss of health triggers more clearly. Better (read: actually existent) tutorial will help, but could also be a lot clearer during gameplay too.
Thanks again for playing and providing great feedback!