The game start, I choose in the menu the type of game (my pet dungeon) & the level (9), but at the end of charging, it return directly on SteamOS.
With SteamOS of the last year (2.148 & 2.154) the game play correctly, and I play the 8 first levels of my pet dungeon without problem.
But with SteamOS of 2019 (2.170, 2.189 & 2.190) the game close after menu.
OS : SteamOS 2.190 (MESA 18.3.4)
Processor : 6 core CPU @ 3,2GHz
Memory : 16 GB RAM
Graphics : ATI 5870HD with 1GB RAM
Hard drive : 1TB with 809GB free
War for the Overworld 2.0.7
Customer support service by UserEcho