What I mean is games designed for C64 first like Armalyt and Uridium etc not coin op conversions like Outrun etc.

The ones I know were worse
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spindizzy on snes
dizzy
leaderboard

Impossible mission,
Nebulus,
Microprose Soccer
Turrican,
Hawkeye,
Barbarian: The Ultimate Warrior,
California Games,
Last ninja,
International Karate,
Creatures,

See, for me either the gameplay is slicker (ie Uridium) or the sound is nicer (last ninja) on the C64 versions more often than not, rarely a 100% improvement. Doesn't anyone find this strange?
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From memory, Nebulus converted pretty well.
Barbarian also. IK+ was better on the 16-bit machines but was likely parallel development.

Leaderboard was good on other systems but it was fairly widespread.

The common element in almost all "worse" 16-bit conversions is that a different author writes the software, and probably with little exposure to the source code of the orignal, which means the gameplay will be an interpretation of the original rather than porting the code which can usually duplicate it near perfectly.

Impossible Mission IMO is an example of poor conversion. The bounds checking is practically non-existent in the Amiga version where the C64 version does it properly. This makes the gameplay very different.

Don't forget Jumpman. Jumpman Lives! was one of the earliest commercial remakes...

You could argue that these sort of games were written bespoke for the C64, and were therefore designed to play to it's strengths. If that was the case, then it would be unlikely that they would be as impressive on other machines.

The other thing is that earlier C64 classics clearly had time and love lavished on them by the programmers, as it was more a case of get it right, rather than get it out. By the time the 16 bit machines came along, the ethos of the industry had changed, and it was more a case of how quickly could a passable rendition be knocked out? Generalising, I know, but probably still true in the majority of cases.

Bangkok Knights. What an abomination it was on Amiga.

Winter Games. Amiga version just didn't have the magic of C64 one.

Do you count Paradroid 90? Graphics and sound-wise it took advantage of Amiga. Playability was good, too, but what a tough game it was.
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Archon is a very nice Amiga game and the SSI RPGs are good as well, although I'm not sure, if they are original c64 games (probably Dos or Apple II). Bignonia also did some nice conversions (Aztec Challenge, etc...).

And don't forget the biggest difference - speed! The Amiga never had a character-based display - all bitmap, and feeble sprites. Most stuff couldn't be run at 50 frames a second like (most?) 64 games. Still, something like Impossible Mission shouldn't have been a problem. I didn't even realise they converted it. I just thought it was the follow-up which if I remember right got a Gold medal in Zzap!

Flimbo's Quest
Great on the C64, but it certainly lost the magic in translation to the Amiga.