This is really a hard choice since all entries are of a different type and each one has a unique and original appeal.

If development time wouldn't matter my first choice would be Mars Runs Red: hidden ruins, caves of Mars, space-stations, primitive life forms... If these games were on a shelf in a store this is the game I would buy and play (...and Sorcerers ).
But, by taking everything into account, my choice is Blink & MMME: game concept can be casual(re-playable), 3D environment can be carefully reduced and time-shift based problems, puzzles & traps are very interesting and can be a great product-sellers.

My vote goes to Blink: Me, Myself and My Enemy.