I don't know why, but the ear-piercing lazer sound and when it gets very bright tickles my mind in a way I can't explain... it's just good.
Yeah, at the last levels I kinda just bruteforced the puzzles, lol. Especially the final one, I have no idea how the hell did I even pass it. The puzzles are really complex, that's respectable, saying as a person who CAN'T construct puzzles.
Also I like how the numbers of the levels are used inside the level. Nice feature.