Concerning the rotating bat logo...
I though too it was intentionnal...
"oh a cute little 3D rotating slowly... normal but cute... er... WTF ? the larger fullscreen is smooth and fast as hell
OMG..."
Completely "great surprise achievement unlocked"...
Also liked the fact both sides are a different colour, but this is slight and nice.
You really choose the right Theme (Batman) as the CPC palette is full of great Blues... and you used them well.
the same on C64 would have been in grey all the way.

as ever...
=My unused RAM : I know, it was some sort of a joke...
=Warmed CPC : yep I must have some dry stuff and perhaps some dust... Was just to tell that my CPC needed smany trys to run the Demo entirelry...
Electronic is not that regular.
Especially with shitty connectic.
And my powersupply was certainly the faultypart...
My Brother connected the 3"1/2 to the +5V of the CPC... while originally it was supposed to have it's own 12V from the monitor (the 3") which is then unused.
If I use an external power supply for my disk drive (I have some spare PC power supply) so the Monitor don't get some micro power shortages...
This may ease... perhaps.
Anyway it managed to work properly at last.
Also get myself a betterly soldered cable for the DiskDrive...
Not a big deal, but I am quite occupied theses days.