This is a super creative idea and masterfully executed! Every puzzle introduces a harder concept, some puzzly and some platformery, best idea I've seen! The controls are pretty great but this could use more vibrant visual clues in the builder, when in a tight spot it's sometimes hard to see whether a block was placed/rotated or denied when the red X is missing. Finished the game and only then found out there's a level skip feature 😅
btw you can stand on a corner of the spikes in one of the last levels (when you have 4 purple blocks, 3 fans, and a rectangle, and jumping down as a full 3x3)