Hi there, thanks for the bug report. What OS and Java Runtime Environment are you running? Windows is recommended, and Mac is no longer supported on newer machines due to Apple dropping support for OpenGL. Linux is generally untested but should work.
If possible, please locate the log file located by default in C:\Users\(Your User Directory)\demonshymn2_log.txt and send it to bugs@untiedgames.com. Or, if there's an obvious error message, feel free to post it in a comment here.