To verify your current version, you can check the "Properties" > "Updates" section within the Steam Client .

: TOMOMI is a side-scrolling metroidvania-style action game available on platforms like Steam.

Are you trying to to this specific version for a mod, or are you having trouble updating your game? TOMOMI update for 4 December 2022 · SteamDB

If you are looking for this specific build or information regarding it, here is the relevant context: