Just checked the web page again, and it sounds like it IS a more or less fully functional C64 -- you just need to add a real USB keyboard to type on it. Wonder if it has a way to emulate a 1541 over USB?
That Ultimate Wizard game I mentioned was made by 'Progressive Peripherals and Software', who some might remember as makers of Amiga add-on cards, frame grabbers and games out of Colorado. Just two guys (worked on the game, at least). I heard some sad news back in the 90s that their office burned down and took out their remaining business with it.
They have a facebook page! https://www.facebook.com/groups/104188856284928/
IA has Wizard, but not Ultimate, so no extra level packs or construction set. https://archive.org/details/C64Videoarchive198-Wizard
It's a nostalgic thing anyway: to me, Bruce Lee and The Last Ninja defined the C64... and my childhood.
edit: according to Mobygames, at least Raid over Moscow was never published on the PC, and certainly not on the arcades. So there's that :P
Some make sense, but the absence of Pirates!, The Bard's Tale series, AD&D Gold Box and Carmen Sandiago games is noticeable. I imagine the licensing is too hard. Then the missed gems like Cauldron I & II, Ultimate Wizard, etc.
I guess I'll stick to VICE.