If you want to cheat (should you need to if you fail too much to get to that green dot and have been trying for hours) just right click then click the green dot.
This game also would have been better as an April Fools Joke. :P
Conserve your bullet time, trust me, you'll need it. It's easy to dodge most attacks by moving your mouse a little. Be sure to all have upgrades and maxed stats. When you are trapped in a corner and he's next to you, USE BULLET TIME! When he starts firing these weird red and black balls, dodge them until you need to use bullet time.
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