I can see all your effort in this short movie. The only advice I could give is this one : find a way to read this book "Richard Williams - The animator's survival kit.

Trust me on this one kid

Pretty cool overall. My favourite part of this was probably the time travelling aspect, although a little bit more variation in the scene following it would have eliminated a bit of the confusion I felt there. I mean, I figured that the red would do something different after having done that but after seeing them do the same things (in other words, after watching the same clips over again) for a while I started to wonder if that was what was really happening. I think the animation is style is mostly good, but could be smoothed out a bit more. I like the background design for the most part, although I would have added a little bit more variation in the sky colour, maybe by using a colour gradient so that it would be a bit more interesting. I do like the way you drew the clouds though.
I think the biggest thing here is the character design and animation could be improved a bit, particularly the action poses. In it's current state it is kind of like watching two ragdolls fight. The way they stand and also lie on the ground just looks a bit... unnatural, I suppose. It's lacking that sense of action you feel when you see, say for example, a DBZ character flying with their arms and legs bent a bit, flexing as if they were about to fight (because, well, they are). I hope that makes sense.
Nice work overall, keep working on it and I think you could easily make something deserving of more stars. If you have any questions, feel free to message me. Looking forward to seeing more. :)