Thank you so much for checking it out and leaving some feedback! Feedback (and answering those technical behind-the-scenes questions) are a part of Game Jams I love.
Thanks for hosting this Game Jam! It really got the creative-juices and ever-elusive inspiration pumping.
I think the motion sickness might have been influenced by the control bar down the right, giving a good 1/3rd of screen that doesn't move all over the shop. I've seen some work around Virtual Reality where motion sickness can be abated by having something "solid" that doesn't move relative to the player around the player's view, to give them something reliable and stable to focus on.
Might not be the case, but that's my bet!