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Up or down?

I found the gameplay to be too hard with no save stones. You might consider some ledges halfway through for a breather - possibly with a refueling station - or saving the really difficult challenges for the end so you encourage the player with easier gameplay in the beginning. It must have taken some work to figure out the geometry for all the force cubes!

DOWN!

Nice level! I beat it both ways and it was well worth my time.