Great first game with a clear premise and several well-thought-out mechanics.
Some ways you can improve this game:
- Limit the framerate: it ran too fast on my computer and I had to cheat a few times to progress
- Some animations for the player, especially when jumping
- More advanced mechanics like coyote time to make the game less frustrating to play
- Some background music/sound effects
The death screen which showed the cause of death was quite a nice addition. Overall, good job and I liked the story!