Not OP, but IMO, Godot. Extremely easy to import assets of any type and prototype a game. The only thing that I would consider a barrier is(if you don't already know how) setting up the initial tilemap and spritesheet. But either using Godot's documentation(which can be found inside of the editor) or through a YouTube tutorial I feel like compared to Unity/UE5 its much better for building quick prototypes.

Plus you can basically put it together in a variety of languages:

https://docs.godotengine.org/en/stable/tutorials/scripting/i...

No I'm not affiliated with Godot in any capacity. I've just had a much better experience using it vs the other previously mentioned editors.

There's also lua love and pygame for quick 2D game projects