Thanks, that means a lot.
A few I didn’t get to:
A twin block — move one and its pair moves the same way somewhere else on the map. You could never spend a stone without paying for it twice.
A melting block — it dissolves a few seconds after you put it down. A bridge you only get to use once, right now.
And making support global: every stone falls when what’s under it goes, not just the loose ones. That one probably turns it into a different game, which is why I left it alone.