Good game. I noticed that you've done a lot of things in you game. Firstly, the main menu is good and then the loading screen is also good, I didn't even think about loading screen but you have made it, huge thumbs up for that. For the main game, I have mixed opinions, firstly, the game and concept is really unique, the game is really good infact, but the only thing that made is a little difficult to play was that the controls were too slippery and the collision boxes are not placed properly. So, there are instances where I would lose even when the mountain is still far away.
But, these things are something you can easily fix. Also, add support for arrow keys. It will make it easier to handle.
Once again, Good Job making this game. The art style is just breathtaking.