I'm having a problem with the collapse event thing. I place it on one tile and a few surrounding tiles break with it.

Here's are the pictures of my problem.

To make interactive scenery objects like Collapse Scenery, you need animations.

The tile above disappears for an unrelated reason which is a very different topic

This isn't related to the topic, which Cooba answered quite well, but I'd reconsider the tile order before you do anything with that... the slopes look quite messy to piece together, and the stuff at the bottom left doesn't seem to be sensibly constructed either. Interesting choice not including any of the loop and corkscrew stuff. Are you going to be including the other palette? I'm not very fond of this one, too orange.

Do you mean the SMS pallet? Eh, why not.