I just downloaded this and played it for the first time last night, and I am hooked!
The NES version had secret underground bunkers full of rescuable POWs that you could expose with a grenade blast. That would be amazing if they could be included in a future version. I'd pay good money for that.
I also generally really like the idea of versions of games that include the best features from every single version/ platform.
Thank you for making this game!