I think you might want to rename the zip file and the folder with the name of the game, it's a little confusing.
I got to the end of the mine; this is a really cute demo and I can imagine it'd be very relaxing to play when the full game is released! I had a little bit of confusion at the beginning about which button to press to start the game and also what the keys were for moving, mining, etc.
I also like to put text speed at the fastest possible because I read fast, but I think it caused the information page that shows up when switching characters to also show and disappear really quickly.
Anyway the art is really beautiful, the sounds are cute, and the background music is relaxing and fitting. It's a neat game and idea!
Good luck!