Just came upon such an interesting bug. I left a game paused and came back to it about an hour later, the game became tremendously accelerated, at least 2x speed. It was actually quite fun and much more dificult, I think a hard mode with an accelerated timescale would be a nice adition.
Interestingly enough, after a couple games with the accelerated time the game became slowed down to a crawl!
Otherwise great little game.