Awesome! While everybody saying this is too difficult, I feel like it's a bit too easy! I stopped at over 500 scores because I felt like it would be endless for me to play. I'm not sure if I haven't played that long and there will be more challenging enemies later on. The technique I used is to release formation and restore full health anytime if I got a chance even if I only lost a bit of health, and switch back to formation 4 very fast and press the right mouse button anytime I can. Again, impressive game!