Rocks'n'Diamonds

So we can have, e.g., levels with crazy fast-moving Biomaze that you need to run away from before it blocks up the exit. Maybe even an option that makes the Game of Life/Biomaze simulation only update when you take a step, for puzzle levels.

Yes, this sounds like a good idea! And it should be fairly easy to implement.

And also the "step control" (as an alternative to a given replication speed) seems worth implementing...