Hey there,
I understand that you're looking for a public Shopify app (from scratch) with limited functionality. I have also taken note that you want the users to edit some .svg images using the app. I have multiple years of experience with Shopify app development so I am the best person for this project.
I have excellent work history, top ratings & feedback from my clients, so I assure you that you're in the right hands. If you have any questions or concerns, please let me know at earliest.
Sincerely,
Wasif