Uhww... I like that "Level -1" idea! Very fitting of the game and theme! Thank you very much for the feedback!
Setting someone back 1 level seemed right to me, just because there is a substantial amount of "Luck" to it. Sure it's easy to die, but it's also really easy to get that one perfect glitch you need on the first attempt, where your controls are still fully functional. That's great if it happens for the player, but doesn't really prove they've mastered the game (at least for me, but I might be too harsh here, and can only look at it from my perspective). The set back is also another way to "hit pause" sort of, same as the "loading screen" does. They're both there to add a bit more time between attempts. The last thing I wanted was for someone to get stuck on the same level repeatedly without any cool down / pause, just randomly spawning glitches and dying until they got the one they wanted. That seemed like the most frustrating way to experience the game.
Secondly, I also didn't want someone spawning glitches, and deliberately killing themselves if they got the wrong one (or one that made the level more difficult), and them immediately retrying the same level without consequences until they got the glitch they wanted. Dying should be a bit of a punishment IMHO. But then again, I might be too harsh here in my thinking. You're definitely not the first one to mention the level set back.
Again thanks playing and the feedback! It's appreciated.