Ah I loved Act Raiser too, it was such an amazing game, though I could never beat it, that part where you had to beat all of the bosses always kicked my ass, I don't think I still have it.
On that note another game made by Quintet [small](The same guys that made Act Raiser, Enix was just the publisher)[/small] is Terranigma, seriously that game is amazing, I think it may be my favourite game on the SNES, and the SNES has one of the best libraries of any console, it's an Action RPG with some Zelda elements but it's just fucking amazing, I do like everything that Quintet did for the SNES [footnote]I don't actually know of any game made by Quintet that wasn't for the SNES, if you know of any please tell me, I like their games.[/footnote] ActRaiser, Illusion of Gaia/Time, Soul Blazer, but seriously Terranigma is easily their best game, sadly I think that was also their last game since that game said Illusion of Gaia 2 was going to be the next Quintet game but I'm pretty sure that never came out, oh well seriously awesome game, I'd recommend watching the 16-bit Gems video of it [http://www.clanofthegraywolf.com/16-bit-gems/15] that Roo from Clan of The Gray Wolf made for it, it's a good video and he actually explains the game instead of just gushing, also if you have a Wii it's available on the Virtual Console, I highly recommend getting it.
I would also like to add Shadowman, look I'm pretty sure that the guys at Retro Studios were inspired by this game when they made this game, I know some of the guys at Retro Studios used to work with Acclaim's Iguana entertainment, so I'm pretty sure they knew about it, anyway it's a third person shooter/platformer and you explore the world pretty much Metroid Prime Style and there's 2 dimensions a dark underwold one and the real one pretty much like Metroid Prime 2, look just trust me if you liked Metroid Prime play this, preferably the DreamCast version since that's the best one but the N64 version was good too, the PC version was good too but had awkward controls and good luck getting it to tun on a modern PC, just trust me it's awesome, also you're enemies are demons and serial killers and just like Metroid Prime it does atmosphere really well, it's a kick ass game, just play it if you find it, I'm pretty sure it's dirt cheap.