Finally managed to beat the game. The enemies requiring you to activate 6 buttons(I don't know how else to call them) are really frustrating. To begin with, I couldn't figure out the rules that set the correct combination, so I just had to guess. Secondly, by the moment they appear you are likely to have speed and bounce upgrades for the projectiles, so that if you miss, they bounce from the walls and hit the wrong button, resetting the combination. Also, the duration that it takes them to reset is too long, often I would already hit the first button, but it was still blinking red, so the hit didn't register.