That's a tricky question lol. I think the game is playable in its current state, but I'm an experienced FitD GM and also I'm the one with the clear creative vision in my head for how it should all work, so ymmv. :P
I've been putting off writing the GM section because I haven't had a chance to run more than two or three playtest sessions, and therefore am not sure what advice to give GMs yet besides just regurgitating stock FitD advice. Have you read Blades in the Dark, Beam Saber, or any other FitD games? If so, their GM sections would probably provide mostly-applicable guidance. If not, I can bump the GM section up my priority list and include it in the v0.2 release that I'm almost done with. If there's anything in particular you'd like guidance on, lmk and I'll be sure to include it.
If you do decide to run it, afaik you'd be the second person ever (after myself) to do so. As such, I'd be very interested to hear how it goes, since you'd be providing valuable playtest data that will influence the game's ongoing development. For the same reason, I'd definitely be available for detailed consultation about anything that you'd like advice on or that's giving your group trouble.
In any case, thanks so much for your interest! ^___^