Clearing wave 14 didn't advance the level, so I couldn't see the rest of the game.
The concept is really original, but lacks a bit of depth : I've seen enemies of the final waves thanks to your left click, and they are really interesting : I think a faster difficulty curve may have helped the experience.
The written tutorial in your page is mandatory, and conveying the purpose and means of interactions with the enemies and your two balls with clearer visual cues would be important.
I couldn't see my health anywhere, I only know from your page that I have 5HP, but yet, every death was a complete surprise.
Really good game overall, with a small lack of clarity.