It is hard, because I often forget to check the itch.io - for instance, I did not see this post lol. My group had been running a campaign in this system for almost 3 years now and we're not planning in stopping any time soon (were abt halfway thru the planned narrative) - so atleast know you have *one* group playing this game! We seriously love this system and even occasionally use it as a basis for oneshots, stripping the RWBYisms and replacing it with generic words if the setting isnt RWBY, and the system honestly works very well, even system agnostic. Ive introduced a few friends into the world of TTRPGs with it and it has worked well as a started as well (teaching people to think of things in a more narrative way, teaching people to be creative, teaching people that its about more than just healthbars rolling dice at eachother, etc.)
I love this game and would, of course, always be willing to see whatever you have, balanced or not! I can playtest your encounter tables too and let you know how that goes, but my instinctive feedback as someone whos been running it forever now id that balance is veeery tricky in this system. Because there arent 'classes' ina strict sense, and the individual players decide their own abilities and strengths and weakness through stats and semblance, enemy balance kind of needs to be hand tuned quite carefully with the players in mind. A set of creative abilities for Grimm would be handy even with that, though, as I often find myself struggling to thinn of more cool things for grimm to do other than bite, stomp, growl, and scratch.
No matter what choice you make, please know you made this group so extremely happy. You have helped us forge bonds we will never forget. For that I will always be appreciative!! Thank you so much.