Ok... my rage has eased now. Let's try to resolve these issues.
I can find some graphics workaround with these opacity bugs so it's not a real issue for me.
But bg music is a BIG PROBLEM.
I concluded that on my phones (both android 2.3.6) sound files inside music folder don't stream anymore but load on first call like sfx.
This is a big problem beacause the phone hangs 10-15 seconds everytime a new bg soundtrack is loaded and then crashes when the ram is full.
Am I the only one experiencing this issue?
Tomorrow I'll be able to test also on android 4.x and then I'll make a detailed report and send it to Ludei.
BTW, pure performance is really great even on older crappy phones.