Hey, thanks for the feedback and all the suggestions. I really like the idea with spending points for some upgrades, at least replenishing lives would definitely be a welcome addition. Good score too, your country thanks you! :D
I already implemented touch controls just for fun and to test how to implement that at all. I also moved the HUD to the upper part of the screen for that purpose. I have to say that personally I found it easier to play on keyboard than by touch. But there was no additional tweaking besides simple mapping of touch behavior to existing keyboard controls. I might continue working on it and throw it as a freebie on Play store if it turns out to be cool.