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Not necessarily, but hosting and playing on the same system will impact game performance, network, and server latency.

No, this game is a battle royale game and requires at least 2 players and an online server to play. Most commonly lobbies get filled with dozens of players.

Yes. I just tested it on Gentoo with Kron4ek's Wine 10.12-ntsync-wow64 build. I used Lutris, just added an already installed game, pointed it to Spellbreak.exe in the root of the extracted files and played the game.

Please don't spew uninformed lies. Wine is a compatibility layer for Windows executables and the community version of Spellbreak runs through Wine on Linux.