I can second the GureenuDev guy. Godot is actually very light weight and still extremely powerful. I think you should give it a try.
See this video. Extremely beautiful graphics
And Unlike Unity (Which takes I guess around 10 GB)
This is only 31 to 36MB if you use Python
And 58 to 63MB if you use C#/.NET
And it runs on almost every computer on earth.