Build tooling stability is one of the great undersold benefits of the ClojureScript ecosystem IMO.
The build process is defined by the compiler (using Google Closure tooling under the hood) and has not significantly changed since the introduction of ClojureScript in 2011.
Since all CLJS projects use the same compiler, the build process works the same everywhere, regardless of which actual build program is being used (Leiningen, shadow-cljs, etc).
You can play online here: http://t3tr0s.com/
Battle Mode is especially fun with a group :) You can see everyone's board in real-time on this page: http://t3tr0s.com/#/spectate