I can see how the game is very difficult to play. It's frustrating to play the game, especially when you lose a lot of progress. The game is fun and could've been better. I'm unsure how the code works, but I hope there can be audio to polish the game. Maybe just a jump effect sound would be better.
Another thing that could be better is the controls. The movement controls is fast, but the jump is the one I'm a little annoyed. Maybe you could've put a coyote jump and jump buffering that would feel the controls more responsive. Here's a small tutorial on how it's implemented on Unity by Jonas Tyroller. I know this is made using a different game engine, but you can understand how the game mechanic work.
Overall, good job submitting this game within a week. I like the graphics, it's small, simple, and cute. Good luck for the future games.