Clojure on CLR just needs more work. Rich Hickey is the original creator but got tired of doing everything twice to support JVM and CLR. There are maintainers but I think they need more help. Arcadia is Clojure + Unity3D, which is CLR.
FYI: One data point, we've been using Arcadia (and ClojureCLR) and it seems to "just work." I think there may be some newer Clojure features that may not be there yet but I haven't run across any (yet.)
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