Bugs
Bugs the only bug i saw was the Heath bug where I had full health but go intsa skilled by spikes
Strengths
The art style 10/10. The movement is really fun to play as well. The upgrade system is fun as well unlocking a double jump feature.
Weaknesses
The bug I would say is the only things. I would also say the writing have no Idea half of what you wrote.
Changes or Improvements
Possibly add fall damage to the game making harder. adding health bonus. Try and fix that bug.