Hiya, welcome to the forums!
You have a very interesting approach to brickfilming here! It's an interesting combination of stop-motion animation and digital animation and I think it works very well overall. Being used to pure stop motion, it took me a minute to get over the extra "bendiness" you give the characters (with their heads going up and down especially), but you don't overdo it and really made it work.
One thing I think you could improve on is blending the stop motion better with the digital animation. Some of the digital animation (like the heads bending) is very smooth, but then when for example someone takes a sip of their drink, the frame rate of that is very low. It makes for a bit of a jarring experience. I'd recommend choosing one frame rate that you can use to both digitally animate and do stop motion with. The facial animation (lip sync) looked to be somewhere in between - maybe you could base it off of that?
Content-wise it was a delightful watch. It really didn't feel like I watched a 5 minute movie - it just flew by and a lot of that is because of the great writing. The little jokes are not laugh-out-loud funny, which I think is perfect for a film that tackles a subject in a pretty serious way. At some points the film did feel a bit like I was watching a lecture, but overall I think you strike a great balance: it's fun to watch while being informative.
Again, I love how you combined stop motion animation with digital animation. It makes for a very cool style! Can't wait for episode 2.