HPMAN (./22):
It should, never had issues

Oooops! Looks like, it's me made a some mistake (most likely, with NeoGeo BIOS choice in MAME) during testing at previous time. If to choose the US 4 slot v2 bios, for example, the NG reacts to coin insertion properly.
Also I wrote the conditions of menu_logo background appearance by more clever way, and background changing to menu_logo confirms that there is no problems with a coins.

And now, what should I do to prevent the credits indicators disappearing after jumping to title/game mode?