I played the fixed version now. Really reminds me of my early games.
- The jumping is atrocious. Definately make the character able to steer in the air. Its too hard to climb basic boxes.
- The backround and ground dont tile well, leading to repeating patters and eye strain.
Not much else to criticize for a small demo. If you fix the jumping you should have a solid base to continue on the game. Keep learning and keepi devvin.