Ok, so MM&D got approved for production, and rather than the 2.5-person team that I'd originally requested, I now have a 7-person team. So that's a pretty big change! Lots of rescoping, scheduling, and organising to do.
Everything's being set up. David is working on functionality for movement, bouncing, climbing, death, and pushing blocks, and the other designers & I have been pumping out puzzle drafts, exploring the possibilities of the 'rules' as they stand.
Below is an interesting puzzle involving a technique we're calling a 'blockswap': to gain access to the 'newest' corpse-block, the player must die twice in the beam, and then use the first corpse-block to push the second clear of the beam.