A teleport effect obtained with the mask extension
https://games.gdevelop-app.com/game-5ad8827b-e7bb-46f2-a873-9e6976a0596b/index.html
X-ray effect:
https://games.gdevelop-app.com/game-d6000057-a850-4b6d-b852-5aebbccab290/index.html
EDIT: The first example doesn’t work on my android phone