Overwhelmingly positive. There've been rough edges, and the learning curve is rather steep – especially if you haven't used Clojure before – but it's worth it.
Re-frame [0] in particular has been a joy to use; I've developed a few large apps in it and they've been quite easy to maintain.
My one recommendation going through the code would be to try and separate the game logic out a bit more. There are things spread between the subs, events and db namespaces that could be abstracted out, and ideally separated from any knowledge of the re-frame db or other external concerns.
This might just be my taste, but quite often I'd like to get to the point that I can unit test all of a game's logic, or even play a version of the game in the REPL, before hooking up what are then very thin subs and event handlers.
Re-frame [0] in particular has been a joy to use; I've developed a few large apps in it and they've been quite easy to maintain.
[0]: https://github.com/day8/re-frame/