The idea was really nice and cleaver, and your level design went really well with it. I think it was a good decision to remove the limitation of needing to have all your hearts to pass the level, although trying to complete them this way offered a great challenge and even a puzzle aspect to the game that was quite enjoyable to figure out. Maybe if you update it you can give a reward if you complete them this way? Maybe unlocking a “side B” secret levels?
Also, the CRT shader make the game look gorgeous :). Congratulations!