A simple Unity game based on this tutorial https://unity3d.com/learn/tutorials/projects/roll-ball-tutorial/introduction-roll-ball?playlist=17141.
You are a ball and you can squash other randomly spawning balls (with audio and animation). The player ball size increases with each squashed ball.
Click for better quality video
Can be built in Unity 2017.3, 2018.4, 2019.3, probably in other versions too.
The Releases page contains builds for Windows, Mac OS (not tested), Linux.
There is also a WebGL version: https://alexp11223.github.io/BallGame/
More detailed overview in Russian: https://www.programmersforum.rocks/t/ballgame-prostaya-igra-na-unity/339