Will the completed version be released onto Itch.io like Steam or is the "in development" tag on the main page an error ?

I forgot to change that. Thanks! The level progression is complete, but I do intend to add some features and polish some things up over time, such as adding some features in the browse menu to be able to find other's levels easier and have a rating system. But, there aren't enough levels in there to care about that yet.