How 'low spec' of a system do you have?
I used a WIndows XP computer with 4 GB of RAM to create my early visual novels using Visual Novelty software, DAZ 3D, and Microsoft Digital Image Pro 9 (you can use GIMP, it's free).
Example:
viewtopic.php?f=3&t=3032The hardware you would need depends on the features of the game you want to create, and what software you use to create it.
If you give us an example (name of the game) of a game that has features like you want to create, I'm sure one of the game makers here can tell you their PC specifications and software.
My opinion (worth exactly what the reader paid for it): This topic might be a better fit for the "Projects" section.