I think I made it to the boss fight (skull floating and flames/projectiles) and that has me getting a little frustrated. Everything up to that point was really intriguing. Some of the puzzles when it was dark were a little tricky, but doable. I got lost a few times, or I guess lost track of what was where but eventually found where I had to go.
I'll attempt that (hopefully) final boss a little later. This is wonderfully unique!