NLT games are some of the most high quality adult games, they're all made using RPGMaker engine, RPGMaker makes the process of making an adventure game easier by already having a streamlined structure for stats, combat, equipment, inventory, maps, etc. A 16:9 ratio is kinda difficult for RPGM games, given the 48*48 tile thing, it has plugins to change games but it mostly depends on map sizes for it to work. RPGM is a very decent engine for making a game like Peasants Quest. The sequel can be made using the same engine, animations and videos can be 16:9 like NLT games. In the end it's the devs decision, he should pick an engine he's most comfortable with and that fits his vision for a game.