Sorry for the late reply.
I had a short look at the demo. Sounds good

About the source code, I saw you kept the dll usage. The best thing would be to have the zxtune library code (ideally a light version) and to be able to link statically. If that is not doable now, at least you should load the dll at runtime and notify if it's missing or if bad version.

Another thing would be to have a special DizzyAGE engine version number, so people deciding to use it don't get confused. Like #define GAME_VERSION "2.4x".

As I told you I have some worries what would happen with games using this version and such songs, if the lib will not be available on future version. I hope one day to release a DizzyAGE for portable platforms, maybe iPhone or Android.

Anyway make sure you include a tool (or link) to convert these to mp3 or something already used by the standard version.

And good luck with your game - I think you're working on one?

на ночь глядя очень туго соображаю, что он от меня хочет?