Thanks! Glad you like it. Hmm, actually, all missions are symmetric, the effect is simply to multiply the game screen and rotate the copies, so you can just play the game on the up-right corner.
I was doing that in the beginning, I drag the game window to the right down corner to make up-right visible only. But in some level, even though all other astronauts collected their radio, one of them didn't ! Was it a glitch then? Hmm.