Shaking the window is a terrible mechanic. Knowing that our action is possible, but having to shake that window for ages to get the coin to land the right way up...
Something much better: Keep your coins, but they automatically flip when you select an action on one side. This allows for a combo mechanic if the coin/tail actions are successful. We could even have the option to build our coins and therefore our coin/tail actions. But seriously, we need to stop making players shake the window.
The game could be really good after this.