Hello and welcome to EAB.
I haven't really looked on that site much, but I agree that game recordings are great. I say this ever since I saw the recording of Shadow of the Beast II being completed on You Tube a few weeks ago - I honestly thought that game was nigh on impossible to finish.
As for Xenon II, you will probably receive mixed reactions. It had gorgeous graphics, and it was made by the Bitmaps, whom I consider the best Amiga game makers ever. But the playability to some rapidly became stale, and the soundtrack became repetitive.
I never played the first Xenon much. And there are heaps of great shooters on the Amiga.