Metal Knuckles is definitely a pretty good character. He feels like the AltSonic version of Knuckles. There are a few problems I'd like to see ironed out, though.
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As Pyrakid said before, pressing jump does not turn the camera around, and pressing spin does nothing. Not only that, but the camera does not zoom out when climbing, like it does with Knuckles, although maybe that's justified since Metal Knuckles can't climb upwards.
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Super Metal Knuckles does not create shockwaves when landing or grabbing onto a wall. I find this odd, since he has a super form by default (though I guess Super Metal Sonic never had an additional ability). Also, Metal Sonic's super color is a metallic version of Super Sonic's, so I think Metal Knuckles' super color should be a metallic version of Super Knuckles' instead of just having Metal Sonic's super color.
I enjoy Metal Knuckles' moves a lot here. I seem to be a sucker for charge moves, so the 'glide' and jump climb are very fun to mess around with. The boost mode just makes it even better.
But Tails Doll... eugh. Maybe I'm just bad at playing him, but he is the absolute jankiest character I have ever played. His floaty "jump", if you can even call it that, feels more like he's being dragged upward by a fishing rod, and his barrier is just an okay ability. The ragdolling is kind of odd looking too, though I guess that's the point. I vastly prefer the other Tails Doll mod on this message board.
Overall, Metal Knuckles far outshines Tails Doll, but I look forward to any new updates that will be released.