Here are the features for Demo 2 that I currently have planned:
-15 more levels
-A blue colored Tumbler that chases you
-The floating text tells you the name for those flashy things
-At the end, the amount of blue flashy things that you got is displayed under the blue flashy thing for more neatness
-At the end, the game tells you how to exit properly
-Possibly a green colored Tumbler that bounces around through the walls towards you
-Possibly more key colors
And maybe some other stuff once if I think of more.
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EDIT: Maxnick, for the second blue flashy thing...
Look for fake walls by the exit.