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Seems like a cool concept but I could not understand the controls

Someone else had a similar issue so here's what I told them:

"The UFO can only break through a block if the block below it is the same colour!" So if the block below the UFO is red, you can break through the red block above the UFO
Red BlockBlue BlockGreen BlockYellow Block
<Position 1><Position 2><Position 3><Position 4>
Red BlockYellow BlockBlue BlockGreen Block
In the example above, the UFO can only go up if it's in <Position 1>

If you need more help, let me know :)