Interesting idea, broke my brain a wee bit for a while but I got the hang of it, tending to try and find places where a cross of five pipe pieces were clearly out of place all at once. The presentation's kind of crazy, but I'm really fond of how in-your-face it is! A couple of issues with 64x64 adherence though, eg pipe rotations were too smooth, but it's not a major hindrance because the game is clearly intended for 64x64 and fundamentally works at that resolution.
Good work!