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Unless I missed something, the author of the game has no indication of creating multiplayer features. The multiplayer mod you found was created by other people, I'm assuming you talking about Saty's Slimerancher Multiplayer mod.
Multiplayer depends on how they set up connections, so there's a "slight chance" you can set it up using only the one copy you have through LAN, but as I have not try the mod, I cannot say for certain.
Edit: but the most common method with Steam/online is indeed, requiring separate users and multiple purchases.