I gotta say, this seems like a solid improvement on your software's capabilities since the last time I heard one of your submissions.
I agree with what others have mentioned already in terms of melodic variation, but something that I hope you'll be able to eventually incorporate is some additional means of handing the overall mix. This could mean reverbs, delays, and EQ but also things like arrangements and adjusting where instruments are in the space (think panning in a DAW, for example). Additionally, if possible, it might also be worth experimenting with the velocity of the midi instruments being used, since that can help an instrument feel a little better if there's a bit of variation with how an instrument is being played (Please correct me if any of this has already been implemented!).
Hopefully that all makes sense, and I hope you continue to make iterations because I'm curious to see where this can go from here.
Keep up the good work :)