Played the demo through just without issue. The items I noted while playing were:
- A paused menu with an exit option would be great (I could only close the game early once started with Alt+F4)
- It would be good to have a windowed mode rather than only be able to run the game in full screen mode
- Maybe show a popup for the controls at the beginning in case the player hasn't read the how to play screen and also a wall jumping tip when that is first required
Nice game!