I am impressed by the graphics and the number of levels. Never seen that kind of dynamic lighting in Flash!
However, I think the level design could be improved significantly. As Kwing pointed out, the levels are tedious. I kept hoping for new mechanics (or interesting interactions between the mechanics), but it just felt like the same mechanics in increasingly convoluted configurations. I would have preferred a smaller number of levels, if they were more interesting or varied.
The lighting mechanic is really cool, but in the context of a puzzle game it seems to do more harm than good. I think the darkness mechanic would be more suitable in a game with enemies, because then it would create constant fear and tension. In a game like this, with no danger, it just creates confusion and frustration.
I experience severe FPS drops in some parts of the game. I'm assuming that's due to the lighting.
(When I run it in Ruffle, the lamp doesn't work, and there are no FPS drops.)
On that note, I also tried increasing the FPS to 60, which made the game much more pleasant. Menu transitions are much smoother, and character speed is increased.
(There's still lag related to lighting though... perhaps a different algorithm would help?)
It's a shame you lost the source files.
I'd love to play an updated version.
It seems FFDEC can decompile it successfully -- both the scripts and the art. Only the fla (project structure) needs to be rebuilt. All the "raw materials" are there!
p.s. the menu in between levels being "playable" is a nice touch