This is a cool and wholesome take on the jam's loop theme, and pretty well executed as well. There's plenty of appeal and it's fun to play, at least for a little bit.
I got up to 120 bows, at which point there really were an enjoyably overwhelming number of boxes on my conveyer. I enjoyed the boxes tumbling about and sometimes adding a suden peril by bouncing forward. The fail condition's timer made this feel fair. I wasn't quite sure sometimes why my gesture wasn't accepted, particularly with circles. I think either the circle gesture analyser needs to be a little more generous or perhaps some feedback could be given on near circles as to why it's not counted as a match (I imagine that this would be much harder to implement however).
I generally need a final goal to keep me engaged with a game, so I would have preferred a fixed number of boxes and a race against the clock to beat pre-determined medal times, but I still think this worked. The early game was good, introducing the concept in a stress free way and gradually introducing more shapes to draw. I also enjoyed the end of my run which was frantic and a lot of fun. The end game was slightly diminished however by the early-middle and middle, which lost my interest a fair bit. I spent too much time just waiting for a box to land with no peril and nothing new being added. Perhaps another game-loop layer would solve this for me - waves of rising difficulty, followed by little audio-visual celebrations and a moment of calm rather than one long, continuous and gradual build in difficulty as is currently used.
The art style is simple and a little rough around the edges, but it's pleasant to look at with a nice colour palette and fits the feel of the game well - really nice. I'm not capable of critiquing music but I thought the music fit the feel of the game well too.
This is a great jam game, nice work!