An excellent idea but making the outcomes disappear so quickly adds too much difficulty to what is already sufficiently challenging. The last few user's trials and their outcomes need to be displayed all the time I think.
Good puzzle, nicely done, but it might have been better to have left the portals and switches out of the early levels so as to make things simpler for beginners.
Quite a good idea and nicely implemented, but far too simple. After a few attempts success becomes routine. It would benefit greatly if it had more levels with different planes, different starting heights and speeds.
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