Why would a memory type game have cards that quickly swap places after every failed match? and you can't click on cards sometimes for, as far as i can tell, no reason? I don't understand the concept, bit disappointing, but maybe i'm missing something?

Level 15 there's a 7 x 5 grid with one unusable space in the middle. Seem to keep coming down to 4 tiles in a 'T' pattern so they can't all be removed. How do you do this?