I really enjoyed and thought the game's main mechanic of moving stones with your cursor to create platforms for yourself to stand on was pretty cool and I think that this mechanic has a lot of potential and can be used in a lot of different things such as puzzles.
But I have one quick suggestion that I really think could help improve the game. It's something that a few other people have already mentioned which is audio. Currently the only sounds you hear while playing are the clicking sounds of your keyboard and mouse so I think you could add some background music. Maybe you could even add sound effects for when you pick up stones, walk, move stones, drop stones, etc.
Other than that, this was a fun game to play and I hope to one day see a finished version.