AGA Amiga game exclusives - from big-house studios - are pretty rare, if they exist at all, as the platform was relatively small and shrinking by the time AGA was put upon the world. In some ways, it's a bit like the C128, except it was at least catered to somewhat especially in Europe. The old 128 was essentially a lost cause from day one, too, except for programmers making software for themselves, to be honest. There was just never any software made for it worth remembering.
It's that whole chicken/egg thing. Don't invest in a platform until it gains more ground, so the platform never grows because no one invests in it. Plus by this time PCs has started to finally catch up with better video and sound cards.
You should probably check out Worms: The Director's Cut. I'm not a big CRT pinball guy, but some swear that Slam Tilt is worth a look (although it was released on Windows in 1997, so it was only an exclusive for a year as it came out in 1996). Another was Fightin' Spirit in '96, which was made by NEO. Again - these were European releases as many US publishers had left the Amiga by then.
Most big-name AGA releases were ports or clones. The ones I mentioned earlier were ports that, frankly, smoke the PC counterpart you've probably seen before. I was thinking you could compare and judge.