Making links easier to click on mobile devices, mobile devices help

I designed my website several years ago. I quite like it but have noticed it is not optimal for mobile devices.

http://isometricland.net/homeworld/homeworld.php

I am thinking the text links in the left column of the tables are too narrowly spaced, but spreading them out looks bad. Does anyone have any advice on how to make these links work better on mobile touch screens, or mobile advice in general?

Would it be better if I designed a separate version of my site entirely just for mobile devices?

Thanks.