It's Lisp-1. If you are interested in comparison with other lisps, the most other popular Lisp-1 I believe is Scheme. Compared to Scheme it is a lot more concise. And has polymorphic functions which work on several collections unlike in Scheme, where you have to always use the correct one, e.g. array-length, string-length.
A lot of inspiration is taken from Clojure with polymorphism and data-structures as function calls, for example, ({:a 1} :a) will print 1 since it is an access for the :a key.
It is also a compiled language, you have an option for native compilation. So unlike Clojure which is dependent on Java or Fennel which is Lua, you get both interpreted side for interactive development and compiled side for speed.
For gamedev you get cool macros as with most lisps. Then there's a good interop with C, much nicer then what you get with Fennel/Lua, you can probably inspect C code for jaylib bindings to get a taste of it.