When building the MoleMash Game initially I have done the game with one mole. It has only one screen. Later for updating the game for 2 moles and dividing levels into easy and hard I added multiple screens to the previous project of one mole. Everything was fine but Screen1 was the one with one mole. On creating apk file for the project the game started from this screen of one mole instead of the initial screen which contained the menu.
In App Inventor the initial screen always is the Screen1 and we cannot rearrange or rename the screens once created. Now to set right I have to rename my Screen2(which should be the initial screen ) as Screen1. I browsed through the net and this link helped me in doing so. https://amerkashi.wordpress.com/2014/06/10/ai-screen-manipulation/