I beat the game (after more tries than i would like to admit.) And i really want to love it. The aesthetics are simple but great, nice sound design, control are good. The idea that you don't run out of bullets, it just shoots slower is really novel and I'm not sure i have seen that before, it's amazing, really.
But the regeneration just feels so cheap. One unlucky pattern or far away ammo spawn and your run is over...