Heya,
Can't really provide a screenshot because once I snap one, the walls look normal on it lol. Considering the problem hasn't been heard of before - I'm thinking it's highly likely the problem is actually on my end. Either it's something to do with the hardware or my eyes are percieving it as slightly transparent due to the colors and speed. Considering the fact that when I take the screenshot they look normal, I'd venture it's the latter. Not really sure.
At least I managed to beat the level right before posting here so there's that, I guess haha.