Forget that I ever asked!

QuickBMS with the mentioned script is working perfect! I just missed the part, that the resulting file is a ktx file and not a straight png. So with an additional step I've got the pictures.

(Sorry for splitting this in two replies, could not add two files at once)

Deobfuscated it should look like this: (Got that image from another, uncomplete & outdated, source)

Sure thing!

Within the zip is the original, obfuscated file from the APK.

Tried to get some png files from "Lego Legacy: Heroes Unboxed", but as usual with Gameloft they are obfuscated. The content of the files start with "GCBF", so I guess they are not compressed additionally. I tried the "gcbf_versus.bms" script from http://aluigi.altervista.org/quickbms.htm but it didn...