Super Mario Bros Remastered A Remake / Celebration of the original 'Super Mario Bros.' games. Features new levels, custom modes, new characters, alongside a full level editor / custom level system!

GPLv3, made with Godot

what is GDScript, why you use this language?

https://gdscript.com/ has the doc

It's the Python-like scripting language used to write games in Godot. Kinda like the C# layer on Unity.

just feel uncomfortale to need learn a new languages

Yeah same feeling here. People have connected Lua to Godot which I haven't tried but should work.