many retro systems have implementations of a language called BASIC, which is about as easy as it sounds. it has some quirks that aren't transferable to newer languages and you won't be able to make anything nearly as sophisticated as retail games for the same hardware but if you find modern engines intimidating, it can be a good place to start

that said, +1 for godot if you want to learn a more modern tool. it's way simpler than it may seem at first and there is a huge wealth of beginner-friendly tutorials available online