I would love to use Elixir for simple non-demanding 2d games. I love the language syntax and i think it will work great for these use cases. Unfortunately, Elixir ecosystem seems to be all about webdev only.
I would say there are at least 4 subgroups that are active in the Elixir community: distributed systems (alongside Erlang), web dev (Phoenix, Plug, etc), data pipelines (GenStage, Broadway, etc), and embedded systems (Nerves, Scenic, etc).
Gaming, as far as I know, is not one of them.