I beat the 4th boss on my second day, I don't really see the difficulty of it. Just play the one game for chips then exchange them for ki, at the moment for every 10 chips I get 4.36 T ki, and don't forget to spend those RYOS. :3
I see as sheild power up, It's all the way on the side, no lasers in sight, I quickly move my mouse to get it, the second I start moving towards it a super speed laser knocks me deh f*** out.