Nice work using Unreal engine! I think most of us used the demo Unity project which saved a lot of time so BIG RESPECT for doing everything yourself with Unreal.
Throwing boxes mechanic is kinda wonky but it works - after 10 minutes I was definitely getting better. I like the fire pit idea but I feel like you should get more points for burning boxes since it happens so rarely? I like how the boxes bounce around on the conveyor belts a little bit. On the 3rd level the boxes got stuck for a while in back, I thought "oh no, game over bug" but I was pleasantly surprised after the 4th box piled up, they eventually all went through and all at once, which was a bit hectic to deal with but good job handling that case.