HOW TO FIGHT THE END BOSS
Okay, first of all, for my review, great game overall. It kept me entertained for a few good hours. Only real complaints are that it was a little short, some weapons were niticably inferior to others, and there were a few glitches, namely the glitch where the end boss doesn't show up, which leads me to...
HOW TO MAKE THE END BOSS SHOW UP:
If you die after the last checkpoint in the level, right before you are supposed to fight the end boss, then when you respawn it will respawn you at the beginning of the boss battle, forcing the end boss to show up. I encountered the same glitch, and this is how I worked around it.
But overall, I liked it. Now I'm gonna check out Redshift!