This was actually VERY well made! It felt simplistic but the scene is super visually pleasing. I didn't last the entire 60 seconds but I made it through quite a few waves and the difficulty scale is up there (probably just my opinion- I'm terrible at this sort of game). The only suggestion I could possibly think of to make this any better would be to add some sort of intense background music. The game already does a phenomenal job of getting the player into it. It's super fast-paced and you have to really pay attention. There were also a lot of little things that I noticed during gameplay that add that extra polish to the game itself. The ability to control the balls with the mouse when you hit them back for precise aim was one of them.
tl;dr - Game was good. Loved it. Etc.
Thanks so much for making this!