I'm not sure about the offline option, waiting for the PS store to update with a ps+ discount before buying it.I do know it has a mode to play against bots either single player or with up to 4 players, just not sure if you can play without the bots.The game is using the Unity engine, not sure if there are any other games using that same engine to use as a starting point?
Mist delivered the ST for this to me already, however, I will be grouping it into the release of additional games coming soon.