I can tell you're a new animator in general, so I'll tell you how to improve. First of all, there needs to be more animation to it rather than just rely on tweening all the time, and even for tweening it could've been better than just having characters sliding around like they are on roller skates. Speaking of characters, I recommend improving on your character designs. My advice is drawing them in a sketch book before putting it through a computer. And finally, you need to insert actual backgrounds instead of leaving the space white. There is plenty to improve on, but with time and patience I know you can do it. And I hope to see you one day at your full potential. Good luck!