If you are experiencing a problem where the game crashes right before the first boss and gives you an "Audio::UTFSEXT" error at the end, it is because Windows is converting Japanese text that we use in the names of our audio files to Unicode in compressed files. The main solution we have found was to keep your windows fully updated, and use a third party extraction program such as Winrar to extract the game.
We also have an alternative, quick solution for those who just want to keep playing our game.
I'd just like to add, if you experienced this problem please post and just let us know. If it's an issue a lot of people are having I'll need to go through the game and manually change every reference to one of the few songs with Japanese in the title. Extracting with winrar should prevent the problem, though.
To other devs, don't be lazy like me and forget to rename songs! ;;