Thanks for the feedback, I confirm that on a mobile device is easy to play and better enjoyable!!
Yes in full screen mode it's unplayable, it's made for mobile devices so it's hard to make a dedicated version in a so short ammount of time (I'm talking about the jam).
Anyway thanks a lot for the feedback, I really appreciate and if you want to try it out, the game is now available on the Google Play Store:
https://play.google.com/store/apps/details?id=com.AntonioPanfili.EasyShapes