I tried to list games harder to find in a search for katamari toward the top.
Some of the very best ended up near the bottom though!
For iOS and Android
Different from the others, but definitely katamari-inspired
It sounds interesting, but it requires VR.
This one's a bit PG-13 ...
This is for Android.
The game is only a little like katamari, but the art style seems katamari-like.
