I'm doing the GBA Jam 2024, so it's for the Gameboy Advance. There is a manager library called Butano that's made the process easier, which could be an engine in a really loose definition.
Besides Butano, I'm just writing all the other things that engines like Unity/Unreal usually manage as part of the project. A 2D top down adventure game is a good first intro because there's not a lot that you need a dedicated engine for, and it's actually been a breeze compared to trying to make something in the Unity editor.