I was playing Albert Odyssey the other day, and it utilizes transparency effects. However, I don't believe they are true effects. If my eyes are not deceiving me, the programmers used a clever technique that quickly alternates between a solid block of color and empty space. As it flashes quickly between the two, it creates the illusion that the solid color is in fact, see-through, but it's not. So there are ways to work around it. I guess when it came to SotN though, this wasn't an option, since my guess is that would have required much more coding than it is worth.
Jorge, as for Maria, I suppose I was being a bit harsh at first. She is definitely meant to destroy things, and she's good at it. In a way, it answers a problem many of the original players had with Richter, in that, you could simply use his whip-dash attack to just plow through any and everything, offering little incentive to actually kill anything from point A to point B. Whether it was just overlooked or a genius strategy, because Maria doesn't have any easy-access special attacks that render her invincible while passing through enemies (I don't really count the invincibility spell, as it's difficult to do on the spot when you're surrounded by approaching enemies), you're forced to stop and tackle whatever is in your way. So it's more akin to the old school Castlevania games, where you didn't necessarily kill enemies because it made you "stronger", but because they're in your way, and there's no going around them. I see that they gave her an air dash in the PSP version. I suppose, she's just another Richter clone here, with a different variety of weapons in her arsenal. But anyway, I suppose my initial complaint was that, when you're just not in the mood to fight, Maria has fewer options to freely wander in comparison to Alucard (bat-dash, mist, Alucard Shield ... etc) and Richter (whip-dash and to a lesser extent, the slide, which causes damage and is useful for going through weak enemies). Of course, I'm also very used to performing Richter's whip-dash, that it's become the go-to attack of choice for most enemies, whether I want to pass through them or not and it's so easy to perform. Her jump still bothers me. Double jumping to clear small regular jumps just doesn't feel right.
I see a lot of talk about the Saturn being the superior 2D system and the Playstation being the superior 3D system, but to be brutally honest, there are many more impressive 2D games on the Playstation than there are on the Saturn. Either it was never utilized to its limit, or people are grossly exaggerating the real difference between the two, I've found to experience that the Playstation, 3D or 2D has always run much smoother than the Saturn could ever hope to. I think the fact that the Playstation filters 2D graphics through its 3D chip, is the reason for this. We have many instances of flat polygonal enemies in SotN that move and rotate with great fluidity, much more than could be afforded were they simply 3D! I've never seen the Saturn do that.