Pixvaders

When you get hit, you lose a bit of health and all your powerups. The problem with this is that difficulty is set pursuant to your level of powerups. This means that when you get hit, you have to grind your way back up to your previous level of difficulty. This takes forever, and since it's easy to dodge the bullets until the highest difficulty (which gives you health power ups) the game never ends. I had to kill myself to stop it.