Web version didnt work for me but the native one worked fine. It needs variety, and at least a tutorial since it took me a while to figure out where the actual places to put the boxes on were. Terrain seemed decorative only, would be cool if the terrain was blocked off and sectioned in a way that forces a specific sequence to get the rocks to the end, like sokoban.

Nice game.
I wish the web version were working so more people would check the game and rate it.
But these things happen during GameJams. 

Good game, I would like to see its evolution