Pretty Good
I liked the idea, but the game play was not very good. The fact that you had to go all the way to the edges to move was what made me quit after the second level. As stated before me, why would you make us shoot with the mouse if we don't even aim.
If you make another one, you should let the player aim and also, make it so that when the time changes, so does the colors, like when is midnight, make everything Dark.