I think you shouldn't be able to fall off the map, just don't allow the player to move there. Other than that, nice concept and very nice presentation.
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Hey thanks for playing! Yeah it was a debate for a while before i acted that falling teaches you to move carefully.
The further you go on a level, the more careful you have to think of your next move in order to get the right face on the right pips and finding a good rotation pattern to avoid rotating for years.
Thanks for you feedback I agree it raises difficulty up. I might add this as an accessibility option in a forthcoming version!