I neither use Galaxy client nor plan to do so in the future. I've downloaded offline installer of the Blazing Chrome version 0.0.6. But still, when I start the game, it gives an error: "GOG INIT FAILED - COULD NOT START COMMUNICATIONSERVICE". It does not affect gameplay but big red letters on top of the screen for about 30 seconds are rather annoying.
Is there any conventional method to shut this 'error' up without installing Galaxy client?

Ok, I've got a good advice from some anonymous guy.
Remove two Galaxy-related dlls from the game folder. Then open Blazing Chrome.exe with a HEX-editor and replace "GOG INIT FAILED -" string with something neutral, like sequence of spaces or "LOADING..." string. Latter one probably would look better, going along with the arcade style.
Beware: actions described above make online leaderboards inaccessible even if you'd want to use those in the fufture.