Hard game is hard, at least with a mouse. Maybe on a touch-screen android it would be fine. The things move too fast to make a selection with a mouse on screen.
Thanks for trying it out; yes, on pcs it's harder because you've 0.5 sec to decide the shape to click.
Anyway the game is now available on the Google Play Store:
https://play.google.com/store/apps/details?id=com.AntonioPanfili.EasyShapes
So if you want to try it out on mobile...