Here is a simple game I developed with Construct 3 and published on Google Play. The game is called Scribbled Invaders, which uses simple hand drawn graphics for a space invaders like game.
You can find the game at https://play.google.com/store/apps/details?id=com.cygriongames.scribbledinvaders
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I like your art. What type of software you use to create the art if you dont mind me asking?
The invader sprites were hand drawn on grid paper then scanned. The other artwork was found doing a simple search on sketched aliens and hand drawn font styles.