When I was playing Maintenence I kept thinking that all the mechanics clicked together in a way that just felt right, but I never stopped to think about the trial and error it must have taken to land on that simple but perfect set of mechanics. This was a great read for learning your thought process and also inspirational to me in how I can approach game design problems and develop tighter games!
I think you made a lot of really clever decisions that paid off. You mention that you wanted to avoid overwhelming puzzles and that's something I actually thought about when I was playing your game -- a lot of puzzle games (especially the shorter ones you find in jams) ramp up complexity to a degree that I look at a level and I don't even know where to begin, but your restraint in designing even your hardest levels encouraged me to keep trying different movements and patterns until I got to the end. In a way, playing the game itself is like an act of constant iteration, so that's a fun bit of meta.
Awesome game, and awesome dev log!