I really like this concept, reminds me a bit of the very first jam game I tried to make (except that was a platformer). I found it a little hard to do the maths on each side when the boxes covered up the total value. It might be easier to play if the numbers spawned quicker but the conveyor ran a little slower (or there was more margin around all the objects). The sound works really well and it's satisfying to get to 0:0!