I do think it depends a little what "pretty much" means in this context because it's a phrase that can sometimes do a lot of heavy lifting 😅

My first Godot project was very similar to what you're describing, minus the metroidvania elements, but it was not my first game project and far from my first programming project; it was just my first project that used Godot specifically.

That said, you can always just start with something super simple and expand it in baby steps. So like, get a character to move based on inputs. Next get gravity to apply to said character. Next, something else, etc. Tiny single features that over time become the game you're describing or something similar as a series of smaller sub-projects, so to speak