This is really good! I'm impressed you were able to come up with a novel puzzle mechanic idea and also implement many interesting puzzles in the timeframe, while adhering to the theme. Great job!
My only complaint is that the mechanic could have been explained, but it was kinda fun to figure out how the stones worked myself.
I recommend trying to remake this in a proper engine with better sprites and sound effects. I think this concept could work as a full game.
Yeah, I wasn't sure if just the first level with a stone and the border would be enough, or if I should have forced it to move on the earlier level with the first stones. I figured it was probably better to not introduce two ideas at once.
I'm slowly working on my own basic C engine for another game, but like 80% of the annoying parts that both would need to do are shared, so I'll probably wind up just incidentally making this a real game on my path to something more ambitious!
