Really fun. Feedback:
- Coyote time is missing (https://kidscancode.org/godot_recipes/4.x/2d/coyote_time/index.html)
- Collider of the spikes are too big. In 2d platform colliders of enemies or traps should be smaller than the sprite of the element, and for the benefits such as checkpoints, ammo or powerups is the other way around.
- Tune a little bit more the control during the jump, it felt odd.
Congrats for the game. I tried to speedrun but I am not very good at it. For speedrun, implement a timer in game.