Nice game!
I like the design very much, just like having a leaderboard integration. I think the key bindings are not the best. Shift (for me) triggers some windows actions when hitting too often xD
The flippers unfortunately did not work well all the time (although I defientely had enough energy). I think the game would profit if the gravity or sped of the balls would be increased a bit. It felt kinda slow regarding it is a flipper game. However, this game mechanics fits the theme perfectly and I also like the little tweaks on using and gathering energy for the different flippers. The music is fine, but kinda short which is why the loop tends to get annoying somehow very fast (at least for me). These are just minors and personal feelings though.
Still: Very good entry!