When running my built game the game crashes instantly, but when I run it in the editor, no errors are visible.
#Game crashing when built
faint marten
open nebula
That is by design
we have a guide here
https://kb.heathen.group/steam/running-a-build
A Steam game should be launched from Steam to run it "properly"
That said you can run it outside of Steam but to do so you need to put a steam_appid.txt in the root with your App ID
this is a standard concept of Steamworks and our atticle goes into more detail
It also links to the steam_appid.txt article which goes into more detail on what that file is, why it is, when to use it and IMPORTANTLY ... when not to use it