Lots of fun. Free, No ads.
Mindless blasting of space objects. Great soundtrack.

Blast space objects with your cannon, which fires shells that explode where you tap on the screen.

You can fire unlimited shells as fast as you can tap on the screen for a very satisfying experience.

You have to lead your targets a bit to hit them. To score the most points, you need to time it so that you kill two targets with one shell so that you get a bigger bonus at the end of the round.

When ever I'm waiting in line (or waiting for anything) I can play this game and the time passes very quickly.