Every time I playtest, I tweak something, but the tweaks to actual mechanics are lessening, and now I'm just getting to the stage of balancing the difficulty

I have no idea where this is going. I don't know if I would want to try to wade into the murky waters of board game publishing or crowdfunding to try to get this out there, or if I just want to have something nice to break out with my board gaming friends

but I am making a thing and enjoying the process, so there's that

That last part is most important, imho

true!