I found this game quite amusing 5/5
And for everyones interest, you beat the nightmare boss by making him hit himself with the meteors. Then he drops gems. collect them and his life will go down.
*SPOILER WARNING!*
Change color: press 1,2,3 and 4
Programmers credit: type jmtb02
Too much contra: type contra (doesn't always work)
The math numbers: visit points in this order: 2-5-3 and 4-5
 "Shopping Cart Hero 2"){kind=icon}
 "Age of War"){kind=icon}
 "Chibi Knight"){kind=icon}
 "Factory Balls 2"){kind=icon}
 "Defend your Honor!"){kind=icon}
 "Level Up!"){kind=icon}
 "Learn to Fly"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Gray"){kind=icon}