I think the inspiration is on the 80's MS-DOS games and you make it good!
The music and sound effects are very similar with 80's games and are perfect with your game style.
The graphics are awsome! You make it good with propused limtations.
The gameplay is fluid and works very well. It's little hard at the beggining, but it's not hard to understand how it works, off course, like an 80's game.
Congrats, friend! I think you realy understand the purpose of the "Era "feel"" and made a great game!