there is no global font settings, unfortunately. AmiKit is a custom compilation of many programs so the fonts have to be changed at many places, in various programs like MUI, VisualPrefs, System, etc. etc. But new AmiKit X supports easy switching between HD ready (720p) and FullHD (1080p) and that includes automatic enlarging of the fonts as well.
Regarding games, if you want to launch them via WHDLoad (the most compatible way) you need to install A500 and/or A1200 kickstarts. More info in AmiKit X Quick Guide here: http://bit.ly/AmiKit-QuickGuide
AmiKit X includes 400 programs including 15 pre-installed games: http://file.amiga.sk/amikit/doc/software.html
You can download a package of 35 more games (ArtiGames) here: https://www.amikit.amiga.sk/store