Your release https://content.minetest.net/packages/Psyco/uwu/releases/6081/ says that this mod won't work with any Minetest versions before 5.0, or with any Minetest versions after 5.3. Are you sure that's correct?
I test the mod in the 5.4-dev version, and i think that can work in the 5.3.
Unless you know that the mod doesn't work with a certain version you should allow it to be used for that version. I've changed it for you