Sure thing.
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From watching the video it seems that he's basically unchanged from his 2.1 incarnation. I may have made an understatement when I said he made some levels impossible. I actually had to get really creative to clear Greenflower Acts 1 and 2 because he moves so slow and has no spindash of any kind that his top speed cannot get him past most quarter pipes or long distance jumps. And even then, I suspect he would be softlocked at DSZ2 at the absolute latest thanks to having no spin maneuver to get past the door-opening wheel, nor way of breaking the floor to take the Amy/Fang route.
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In terms of what he doesn't have, he lacks a continue icon, special stage sprites, ending sprites, and super sprites. If you somehow manage to go super, he is only marginally faster than his normal walking speed.