It's good and it's on phones but it would be nice to know if you can't move at all and have a restart button and do a different set and yes I know there is an undo button which is nice.
The "new game" button is next to the undo button: looks like >
maybe not the best icon choice though...
The stacking mechanic works fine, however, the game's shuffle when making a new game is not balanced and will often leave the player with no moves to use. After restarting the game multiple times, I've found it impossible to clear even the first layer, sometimes unable to move any card at all. I would recomend you fix that
Hi, 99.9% of the layouts are solvable... really, I swear
(somehow it sounds like you didn't use the free cells...)