Hi there Fred,
That's exactly what it is: A Prohibition knock-off :)
But there's also a small complication. The game I actually know well is an arcade game from 1987 called Empire City 1931. It got ported to many home computer platforms and was renamed to Prohibition.
I took creative licence because I didn't do scrolling screens for the VIC version as it would strain my technical abilities to the max and there's also some VIC memory limitations. Also the levels are just my own ideas and things.
So yeah I'm glad I could help give you a bit of nostalgia for the game.
Greetings and thanks a bunch for your comment
Huffelduff