Hey Heckert!
Seems like a good start of a project. Too bad there's no actual work after the training day! :D
I bumped into one bug on the training day as well. If you line up the stones on the crossing so that there's no space between, but push the bottom one to the right and to the goal, the one above it gets stuck and you can't progress from 2/3 at all. Only restart works.
I would be interested to see where this game develops in the future!
Cheers!