I played your game and had some thoughts of improvement! Hope it helps!
- White border around text for better visibility.
- Pause function.
- No movement animation when moving with controller.
- No way to enter/exit caves with controller.
- You should be able to see the eyes of the character when moving downwards.
- I think I walked out of the map, a black border came and then it started blinking. It was after the third or fourth checkpoint thingy. I walked straight upwards for a while.
Anyway, this was my thoughts during the time I played. It's looking really good! :) You got inspiration from Journey didn't you? Good job!