Very simple but challenging! I think sometimes, the conveyor belts moved a little too quickly to even be possible to catch the boxes. Maybe there could be some other elements to the gameplay that switch up the speeds, or something allow forgiveness and more skill-factor if you miss seeing a box right away, so that you still have a chance to retrieve it.
I'm not sure how much of the assets you created or which ones were public assets, but it visually looks very appealing, and I thought the audio was great too!
I love how when you lose, you're just in this void of nothingness and dead battery forever.
Overall, great work! It was enjoyable for sure.
-D