No need to Tween em' ALL...
Salam....
Alright, I think u got passion in animation... But I notice u use ALOT of tweening, almost all of em..
The walking cycle, once the guy swing his hand, once the hand reach another side, it quickly move to swing other side... So, I think, u should adjuz that abit...
How bout, once the arm swing from left to right, have it rest for about 1-2 frame, no tweening, then continue the tweening again...
Also, the drawing, no bad... Juz that it look stiff cuz the body r half of oval & the head a lol bit too small & the body r long & wide, make it look like u want to fill the screen but forgot to enlarge the head...
Btw, the guy who thrown the ball & wen he laugh, that's the perfect example how u should draw ur character, the body scale look good.
Hope my review helps & hope u dont feel offended wif these whole lot cons review.. <:)