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 Block | Blue Block | Green Block | Yellow Block |
| <Position 1> | <Position 2> | <Position 3> | <Position 4> |
| Red Block | Yellow Block | Blue Block | Green 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 :)