oh for your first try this is amazing! I would always recommend doing playtests outside of just yourself playing it as well! when I create Shotgun Goldfish for this jam I also struggled with difficulty and I've been messing with unity for years lol. my method for that which I only started doing by the end was that if I ever died on a level it was probably too difficult since i should know how to do it perfectly as a designer (this may not apply to all games/genres though)