Yes, this release only for 1.5 (also for psp fat). There is a release for 3.xx (also for slim, too) (released 26.nov 2007).
Yes, Commander Keen runs- okay, i tested the current build with Slipstream 5000, Settlers 2 and Prehistoric. Prehistoric runs very well, Slipstream 5000 runs very slow (unplayable or you like slowmotion) and Settlers 2, i started the game and get the title screen, after loading a mission(level), my psp crashed (i think s2 and ss5000 needs to many processor power to run playable on psp).
I tested Spear of Destiny and Wolfenstein 3D on earlier versions and both runs good but a little slow.
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