I am on wave 500, the horseman is dead, but the game still indicate it as the "current wave" and doesn't move toward bonus rounds. This quite infuriating, especially when it is the best run I have ever made so far... Do you have any wave to debug it ?
This is the first time I hear of this. I am on a bonus round right now so it's not a bug that affects everyone. Could you post a print screen?
also UL your savegame, might give some clues. (requires root-access).