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Maybe a bit biased cause I'm the developer but my game Scribble Racer was mentioned at some places as a game making great use of the S Pen in the past.
I just launched its sequel Scribble Racer 2 in July.
Here's the app store link to my game: https://itunes.apple.com/us/app/scribble-racer-follow-line/id976631375?mt=8 or for Android: https://play.google.com/store/apps/details?id=com.wolfgangknecht.scribbler
Scribble Racer 2 is the sequel of Scribble Racer
It's a mobile game for Android and iOS where the player has to stay within a scrolling track while it gets faster and faster. Scribble Racer 2 will come with new features which should keep up the motivation for players to play it more often(Scribble Racer somehow failed on that).
The new key feature will be the drawings. These are basically images created by completing tracks -> the line you draw during gameplay creates the outlines of an image which you can then paint in the manner of Draw Something.
Screenshot of the stuff I did this week: