Nothing is more fun than staring at a screen for two straight hours trying to hit moving notes and then looking away from the screen and seeing like you're in a fish tank.
Check a "save" menu. If you see a red warning there, then you have a disabled cookies(it affects local storage), in private mode, or something like this, what prevents me to store anything.
 "SCGMD4"){kind=icon}
 "Robot Wants Kitty"){kind=icon}
 "Age of War"){kind=icon}
 "Idle Recruit"){kind=icon}
 "Learn to Fly 3"){kind=icon}
 "Mutilate-a-Doll 2"){kind=icon}
 "Kongregate Insult Generator"){kind=icon}
 "Endless Expansion"){kind=icon}
 "Doodle God"){kind=icon}
 "Contract Wars"){kind=icon}
 "Brick-Force"){kind=icon}
Check a "save" menu. If you see a red warning there, then you have a disabled cookies(it affects local storage), in private mode, or something like this, what prevents me to store anything.