As far as I know, Steam Overlay has never been activated, globally.

~/.config/unity3d/Subterranean Games/War For The Overworld/Player.log
It happened again after 20 min with another map (king of the underhill game). This time I was using the nouveau driver and not the NVIDIA closed one.

Hello,
WFTO 2.0.4 freezes here after 2 minutes of play in the "slap 100 dwarfs" scenario.Player.log

Kubuntu 18.04 with kernel 4.17.0-996-generic ; NVIDIA Quadro K620 with driver 396.45.

No, they were arcanists and priestesses and so. Enemies entering the room but not being on it when it was converted are not immune.
In case this helps : this was with a legacy map (created with v 1.4). I cannot provide a save as saving does not work (see my bug report from today).

No, this is on a room that originally belongs to the enemy and that I have converted (a very big room, enabling imps to convert it from one side while the enemy units are "busy" fighting my minions on the other side).

I will test this later as there is a self-imposed rule that I may not play computer games as long as there exist ungraded papers on my desktop (of which I currently have 48, and 47 new ones next Monday).

Bonjour. C'est avec quelle distribution Linux ?

Sorry for the misunderstanding (however, understanding an incomplete sentence is quite difficult).

I tried the map with the latest patch ; it works. I do not know if this is conclusive or the problem just appears in circumstances that do not exist in every game.

Yes, this works for me too. Great !

Plait-il ?