Cool game ! Really engaging. My only use would be that the decay seems random ? Or maybe I didnt understand, meaning planning ahead is that rewarded, so I felt making the steel blocks was the worth it as they took a lot of time and ressource to make and you could still lose it quickly due to random decay. So I went more for a reactive approach, mostly using the bigger rock ones and wood for panic moments to save it from all collapsing. I liked that you could place blocks in between each other and it would still work pushing everything a bit to the side. I also had an issue that jumping with the robot would sometimes push the platform, ruining my beautiful shaky creation. Also one little other thingy, I watched the controls, played the game, forgot the controls and pressed start and I could quit or see the controls again, would've been nice to have the controls in the pause menu, for people like me with 0 memory.
Really cool idea and it was fun !