This was a quaint and challenging puzzler. The atmosphere is fantastic. It's a tad dark around the player, and I stepped off a couple of ledges at first, but it did make exploring with the ball of light rewarding. The mechanics were really fun. I was also engaged by the story of the end of Alteris.
I only ran into one major bug; I think a couple of wisps in the second level (the ones right next to each other) were mistakenly linked to the torch on the top of the cliff, instead of the one near them.
Great work!