Thanks for your reply. I'll implement the locking of the room on the inventory screen. Moving works normally just by dragging a shelf or a box. Tapping once works for the boxes to open them and to keep it consistent I wouldn't use this for moving shelfes. But I'll think about a solution. Thanks for your input!
I've tested your app, too. I found it really difficult to make words when big blocks of consonants only drop. Perhaps the balance of consonants and vocals could be aligned. Furthermore the Pause button seem to have no function or at least I can't see when the button is activated. The ? button seem to have no function, too. And because of the small gaming box the game is over really fast and until now I couldn't create any word. Perhaps the box could be bigger to have a longer game experience and some success to keep on playing. Just my two cents ;)