Forgive the long wait for my reply. Can you give me some more information on what device you're using and the operating system it's running?
Is the game giving you an error or is it just crashing and returning to your homescreen?
The only thing I can think of that may cause this would be the game getting corrupted during download, so maybe you could try re downloading the file.
If all else fails, I'll try to rectify this bug in the next update.