It's really weird noone has noticed this game since nearly three months. This is a well done prototype with good balancing not making it a random button spammer. I was surprised how many of the obstacles are destroyable. From my observations it's more like 'Groundbuilding' but it doesn't sound that cool. There is a moment in the gameplay where I got teleported back to mines after leaving them but I guess it's only an issue with character positioned too close to portal. Luckily there was a 'back to Village' option in menu so it saved me. I don't know how the maximum speed upgrade is but it already feels very fast. My only suggestion is to make more levels that force you to use the special mechanic of building bridges and stairs. Maybe it will make some puzzles out of it.
Also the music is just pure joyful experience.