[Proton] Slap City Gameplay

Quick 1-on-1 match with an online player. First minute or so will be laggy, but framerate will improve from that point on. To run on Proton use: `disable-native-gc` Steam: https://store.steampowered.com/app/725480/Slap_City/ Humble Bundle: https://www.humblebundle.com/store/slap-city