Donut Inc.

Playing on my iPad Air, the controls are janky. The characters you control stutter while moving, especially when the temporary upgrade appear or disappear and just before the ads come up. The employees I hire get stuck running in place and not doing any work. First time I played I was unable to complete the first store as the player character got stuck and was unable to move. Reinstalled the game and then I made it to the 3rd shop, but now all 3 are stuck and I cannot unlock the next shop