What worked:
It's a really solid puzzle platformer. All the added mechanics work really well both by themselves and when added together with the previous ones. The parts where you have to jump through an area toggling the light to bypass obstacles were my favorite. The part where you have to drop a lamp was also really cool, and I wish I saw more of that.
What didn't:
I ended up dying once because I was standing on the edge of a platform and ended up rolling off haha. I don't know if this is worth fixing (since you'd lose out on the advantages of having it like that and it's only on the very edge of platforms), but it didn't feel good.
I'm just not personally too big a fan of timing puzzles/challenges. This one is purely personal preference, but my least favorite challenges involved flickering and moving lights.
I think it'd be better to have lamp pick up be set to a key (could be same as drop lamp) since I often set it down, then promptly picked it up again just trying to move around.
Bugs:
Didn't see any.
Great job!