Does this mean that there's code-entry somewhere later on in the game to receive various cosmetics?You are correct except for the masks which were already included in the last update, they gave out 2 more codes for them though. They still have a lot of codes to give out but we have them all in the translation already with all codes since they left that in haha.
I will be working on 1.3.0 as I suspect this is the last update we will see, at least for a long time if not ever. I have to redo everything again though due to them making changes in every level.
I was worried that they might be eShop DLC codes, but that doesn't seem to be the case.
It's frustrating that it takes such a significant effort to support a new update, but it does not go unappreciated!