I did send him a message already and didn't get an answer, yet. Furthermore there are some other things that confuse me. Everyone here tries to convince me that this is the lucasfan fan game.
[crazy conspiracy theory]
Why do they make fun of me? Everyone can see it's not the FM-Towns version. Is there something they don't want to talk about? Do they have a secret Zak McKracken version? I think the ScummVM guys were the first ones who discovered the FM-Towns version, too!
And there are many another weird things... There's a remake of Maniac Mansion called Maniac Mansion Deluxe but it's not shown in the video. Why not? Well... Maybe because it's only a fan game! What about the SCUMM-Interface of the unknown version? It looks like the one of the FM-Towns and many other early LucasArts adventure games. The items are still text-based and there's a 'what is' command lol! I've played a lot of fan games but none of them featured something like this.
[/crazy conspiracy theory]
Forget the Alien Mindbenders! This is much more obscure! ;-)