Great demo, maybe too short.
The "entity" is maybe a little bit too slower. A keyboard shortcut to increase the speed of the game, like the slow-mo one, could be a good solution.
I hated the chase with the Scaredy. Please kick it of the game! (or see my previous idea)
The "vortex" level was great but too short. I think you can increase the size cap needed to finish this level.
And the tutorial need to talk about/include the useful shortcuts, like the reset one ("z") and the pause one ("p").
(sorry for my english, I'm french!)