You suck Secrets.
With that out of the way =D
The choppiness of the game kinda ruins the accuracy required for the puzzles, and the blank background leaves a lot to be desired, coupled with the lack of sound. If you were to add some outlines, color, and curves to the objects, while doing the above and giving it sound at a later point, it could be fun.
Cheers, 3/5, because we love you.
The controls are a bit awkward, pressing the arrows once barely moves you, double tapping it does like a "lane shift" so it's hard to be precise, the collision detection seems awkward at times, and it looks like the power up cubes move at a different speed than the obstacles. Not have a restart button sucks, too.
With the invisability thing:
Try to still dodge stuff. Use the invis like it was a temporary safety precaution, so that when it runs out, you're still playing like normal, except you didn't take any damage.
 "A Knight's Story 2"){kind=icon}
 "Red Remover"){kind=icon}
 "Secrets Challenge"){kind=icon}
 "Vector Runner"){kind=icon}
 "Air Wave"){kind=icon}
 "Beez"){kind=icon}
 "The NERD Quiz"){kind=icon}