Thanks for your great review! We're still actively working on the game, and it's very new. A help UI is something we're considering, and click-and-drag placement may be added in the future.
The issue with rotating deleting the tile underneath is a bug caused by the recently added Steam Deck controls. Sometimes, Steam Deck controls conflict with desktop controls, leading to problems like the rotating. We're looking forward fixing this in the next patch!
We appreciate your feedback and support lemo999!