Nice work. I was able to make it to the end. Although I did have the glitch where you can't restart on the first level with the dark portal. Sadly that gets really frustrating as it takes a bit of trial and error to figure out how to use the portal, which means playing through again after reloading. Once I understood it, the puzzles really came together. I think the main thing needed is a better way to make the player understand how the portal works. Great job.