That's a cool platformer the difficulty scaling is fair. I tried making a level just to realise how horrible I was at level designing 😆
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If the "Test Level" Button to publish a level doesn't respond:
There is a known bug in this version that you can't paint more than 32 Tiles in each direction from the startposition. So don't make the Level too big or use the platforms, it's just the painttool that has this limit. If your level is too big you can't hit start and you have to erase some painted tilemaps