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Typeclasses are the big one I'd say. User defined operators are missing. Direct foreign function access is missing as well - for js stuff you have to communicate through "ports", you can't call js functions striaght from elm code. Also its not a general purpose language, you can't write a commandline tool with it or compile it to native code.
Both Purescript and Elm are a joy to work with, have good helpful compilers, and plenty of documentation. Using either the Purescript Book or the Elm Guide would be a great start. They both support 2D games as well: Purescript and Elm