Tangent - Personal Project
Back in 2015 I created a mobile game called Tangent. I wanted to experiment with Cordova, a cross-platform app framework. I gave it away for free and then removed it a year later. It received over 10,000 downloads in that year, and people can and do still play it today (provided they downloaded it when it was available and don't get new phones.)
Here's a little demo, sorry it's only 15 seconds but you get the idea.