I have no experience with Steam Workshop but I'm close to releasing my first Steam game and was / am worried whether or not Steam features were worth implementing since I have a speedrun timer for each level and a level editor (I use .ini) and have no idea how those would translate over.
Despite not having experience with Steam Workshop I did plan somewhat ahead on not implementing it. Like hosting community made levels to download on our website and having players share screenshots of their speedrun times in the Discussions tab on Steam. Still adding things like Steam Cards and a Leaderboard are enticing features I'd love to have.
Regardless I'm glad Mondrian is going strong and pivoting in a good direction for fans and players, I look forward to the upcoming updates and release on itch!