It shows that it has been a labour of love. Kudos!
My 2 cents: I would like to have a "View store as customer" link, which shows a preview of the store. I created a single dummy product and tried accessing it at https://memememe.mymmerch.com/ which threw an internal error. Also, the Add Product page is a tad long and would be better if broken up into 2-3 pages.
Again, great work! Good luck.