The point of the game is to move your cursor over the yellow rockets: because for each rocket you hit it not only raises your score, it makes the music louder, more intense and so you don't lose. Remember cursor over rockets makes it more loud and fun!!! :D
My strategy : Chose the blue girl and use Ladon, then keep doing the first level till you get to level 5(and for your spirit beast first upgrade his Crimson stones, then azure to get Gargoyle) and for your stat points put it all in Agi. After all that buy Memory Ring x2. You should be pretty badass after this.
Just wondering.... Does the guy driving the car instantaneously setup a nice garage right in the middle of the zombie infested streets?(Because when I die I get to go in a garage) and on top of that the military can't find me in the middle of the highway in a metal structure... Just sayin'
For second boss, first drop your weapon then go to opposite side of the Gnome Rider wait till he rushes towards you then dash towards him and go to either top/bottom and if he drops a spear grab it and throw it at him. Hope this helped.