Thanks for reporting - can you try hitting the home button in the corner and check you can exit back to the main screen?
If you have it purchased and feel a bit more tech savvy - you can head to "%APPDATA%\..\LocalLow\BeenCha\HC1" by pasting it into a windows explorer, there should be a "Player.log" file that you can send me the last few lines (open with notepad) - hopefully it is some sort of error I can look into. Keep in mind, it might some identifying data about your computer etc at the beginning of the file, so best not to post the whole thing.
Congrats for being the 4th person (out of almost 8000 successful plays!) to report this weird and rare bug! :D