Thanks a lot for your comment, it's effectively a problem that encounter players with the punitive aspect of my game.
I thought it was suitable for a die and retry style but it seems not to be suitable anymore.
Moreover I was a bit short of time in the jam and a bit lazy. I admit that with my archaic code, I choosed to not regard the possibility to save a moment and retry it x)
But whatever, maybe after the jam, I will find the time to add your step back idea in my game ?