This was a tough game. I couldn't finish level 7 without help. Despite the hint and the tessellation hints, I didn't see the pattern. However, that isn't what's stopping this from being a 5-star rating.
I would have liked a little more story. Let me know what we were doing in the cave, or what sort of god this was. Give me more depth. There was obvious room for it.
All in all it was an awesome way to exercise my brain, something that I haven't been doing enough of lately. Thanks!