Aw, well I appreciate that man! :O I don't REQUIRE a refund, I'd just like a functioning program more than anything, but if you feel like doing that it's your choice. I admit I've gotten very frustrated today in failing to use it, but if the bugs can be solved that would be great. I think your program has potential, it's just not there yet. (Kinda feels like it needs a $5 Early Access version or something until it's all polished up and maybe expanded a bit, then $15 would be fair. I guess Itch doesn't really have an Early Access feature though.)
Here, let me give you another console log I noticed. When I start the program up, it actually gives me this odd message which might relate to the other problem? Perhaps this will give you more to work off of.
The 'fluidsynth error' line happens at the end of program startup. It's very confusing as I have a perfectly-functional MIDI device on my system.
The stuff following that fluidsynth error line happens when I try to do my first generation. (The generations do seem to work and play fine, but it seems something is buggy with that process; the message certainly sounds ominous at least.)