Solid controls, very responsive. Really liked the screen shader! I was surprised when I got hit while in the upgrade screen but I think that might be by design since it is a time slowdown and not a full pause, so it is skill issue by my part.
Thanks! I thought I made the player invencible during the upgrade screen, but I guess It only works for small enemies... It's not a skill issue, because you can't move during that screen ;)