I feel like this is basically RNG pachinko right now because there isn't enough the player can do to control the boulder. I think the main issue is how much of an impact absolutely everything in the path has on direction. If the boulder is heavy and has momentum I'm not sure it should get tossed to the side by a small jar to the extent that it does. That said, I like the concept and with some tweaks I think it could be fun. Although there is something entertaining about starting it and watching the boulder go right now, haha.