Thanks for the feedback! Yeah this is definitely designed first and foremost for those who want to dip their toes into music rather than those who are experienced composers (this was actually made for a specific person I know who lamented on not having something like this)
That said, I am ALSO a fan of the locrian mode and I would love to extend the functionality of the device. Not just with added modes, there are many things I thought about adding that just didn't fit an MVP or were a struggle to fit in the confines of the GBA: inversions / voicings, other chord types, the ability to break key... all of these I think are essential in actual interesting composition work, so this definitely is more of a toy as it stands.
Inspiration wise I think personally I get more out of using the sequenced arpeggio as a melody generator of sorts than the available chordset.
Thanks for the bug report as well, that's really frustrating since I know how to fix it pretty quickly... aaaah well.