Welcome to Bricks In Motion!
Introduce yourself here
Well done for completing your first brickfilm. It is very good for a first.
Of course, we all have our flaws when we do our first animation. Your camera and set is a bit shaky (we call them set bumps), it's best to keep the camera, set and stationary props stable as much as possible so the audience's could focus on the what you want them to see. The focus changes very often, getting to know your camera better can help.
It's good to see you animating a frame rate that's not very low, keep it up. Doing more subtle movements can help so the transition to look smoother, it's hard to see the difference at first but it'll help.
There's quite likely an option in your software called "onion skin". It help you see how much you moved your set and figures and it will also help you bring your set to the position you the frame it was before. "Onion skin" is very helpful for people who suffers from bumping their sets too much.
Another flaw is light flickers, I suffer from it too, the best thing to do is to not allow any natural light into your set (eg. sun and moon reflection) and wear dark clothes to absorb the light and not reflect it.
Improve each thing one by one, fixing all of them at once could be a bit stressful.
If you have any questions, don't be afraid to ask one in the forums.
Good luck, have fun animating.