Nice idea I like being able to design your own table but that's about all. It's too fiddly on a mobile and no back button if you make a mistake so making a playable table is very difficult. I don't like the balls being dropped from the top. Much better to have the balls fired from a spring as on a traditional game. Probably worst of all is there isn't any score displayed so are you supposed to add it up in your head? Don't bother.
Undo last pin placed button added to Edit screen