20 likes isn't going to happen with this quality of work. For the record, some people won't even like it just because you said "20 likes and I'll release the full one."
Slow motion isn't a mess of ease and out, nor are fight scenes. When I used to animate, fight scenes were hard. They always are. You need to understand that using transitions for quick movements is almost never a good idea. That leads to something else, this is slow. Way too slow. And I know what you're trying to do with the explosions and whatnot, but it's not gonna work like that. The ground and the camera is gonna need some impact to themselves to simulate quick and hard movement. What's more, scenery helps. You said it was two brothers training? Put them in a dojo, what's more, make them look similar if they're brothers. The facial movements were... not good. The punches had little impact, if any. And that crash and tumble and the end seems like you never did the "ball animation."
Afterthought, it's "bear."