And now for something completely different

So, about 4 hours ago (midnight here), with 22 hours left in the competition, I decided to scrap the idea I was working on and make a different game.

The original idea was a turn based strategy game, where, essentially, your units would gain bonuses for being isolated from their teammates. I knew that was over-ambitious to begin with though, and it was taking to long to get the basic control system working, so I gave up on it.

My new idea is much simpler, and I think I can get it done in the remaining time (even accounting for sleep). So far the game looks like this:

my voice just echoes off these walls

This is a hint about the gameplay: