The Facebook messenger game for a long time, everyone was playing this. Runs could go really long too dodging projectiles and killing the enemy waves. Solid time waster with an integrated social system within Messenger to try to beat friends' high scores.

Now filled with IAPs, of course - had to click through like six pop-up "purchase this bundle" before I could even try playing this. But for its time, it was solid.

at some point EVERYONE was playing this