PTD: Pinball Tower Defense

I think that you got a concept for a great game, however there are some things that I'd like to see changed.
some smaller things:
-healing between stages would be really good. I lost 4hp on 1st stage and never recovered any
-different color for balls from the tank, so it's easier to track them
-ability to change bumper keys. z and / are certainly interesting, but an option to change it would be nice
some bigger things:
-ability to add some bumpers that don't do anything other than rebounce the ball would be really nice. They probably shouldn't count into the main limit though
-1 ball for the most time is... fine, but the game is definetely more enjoyable with more balls on the board. My solution for this is simple: 2 balls, spawning on different sides. It would require bigger respawn time and less damage, but I think that the game would benefit from that change

balancing also could be slightly changed, but the most important thing is the game feel. I really enjoyed my time with the game, and I would be glad if any of the features listed above were added. I will be definetely waiting for any updates

clever mash-up. tweak the balance and add a fullscreen button? :)