There’s a certain aesthetically pleasing pattern you can recognize here and apply – going in loops around the teleport tiles, avoiding leaving ends.
If you’re having trouble, I suggest tackling tile 7 first:
Then comes the trickiest part of the level: the stretch of blocks to the right of the two #3 teleport tiles. The key is to create a “bridge” of sorts from one of the #3 tiles, while clearing out all other tiles connected to the other #3 tile. You want to try to get to a position like the below:
From this point on it shouldn’t be too hard. Just be careful not to create any ends.