Small correction for levels 0 and 1: playground belongs to the leisure key, not amenity.

Besides that, I have mapped a few playground structures in detail and would love to see a rendering that supports all the values of Key:playground.

Cool project! I also try to map all s in my city, but it doesn't have such a nice street grid :)

@Xvtn in case you have an Android phone, maybe take a look at https://github.com/labexp/osmtracker-android which does exactly what you described.