I echo what everyone's said about the visuals, and I'd like to also extend that to the cutscenes. The game has a visual identity strong enough that I'm really surprised about there being no store assets here!
The gameplay loop is pretty solid but I find myself wanting more out of the level design. I did have the key spawn in the same place twice in a row, I'll admit, but the gold key being in the same place and the game ultimately ending right after has me wanting a larger level to explore, and perhaps another key. I certainly get it makes sense within the story, but if nothing else I would've loved a larger level, especially for a factory. There's also a little too many batteries, I found myself basically never worrying about my flashlight. There's definitely a solid base here though, and I'd readily play a sequel :) good job all in all!