Leumas

I've been looking into game making software, but I'm having a dilema. I'm looking for software that I can make a game that is supported by the NES emulator in Retropie, but some of the game makers are using mapper 30 which as far as I could tell wasn't supported. I also know that there are some people that use pygame to make games, but I'm looking for a drag and drop than a hard coding. (I just don't see the necessity of inventing the wheel again, if you hear what I mean.) Any help would be nice...