I support this request.
The game is actually titled:
Code Name: S.T.E.A.M.
Additionally, in the English language, "codename" isn't traditionally a single compound word like this; it's just generally accepted that way. Official descriptions of a code name keep the words separated instead of compounding them:
A code name, call sign or cryptonym is a code word or name used, sometimes clandestinely, to refer to another name, word, project, or person.