Hey, Ikermel, I was just reading your site and noticed a few things.
Keeper was announced for a North American release as CyberSlider, though it would have had changed graphics. As you may guess, it was changed to more of a robot theme than sealife.
http://forums.lostlevels.org/viewtop...=asc&start=100
For Super Pang, you list the EU release but it was also released in North America as Super Buster Bros.
About Phalanx, I remember reading a letter in EGM around 2000 or 2001, and confirmed Kemco did indeed change the NA boxart because they hoped the game would get more attention.
Again, great site.