I also just got all of the letters in "Mace", but it didn't say that I won, so I clicked a random spot on the screen and it said "You Lose". You should also have the game show you the word when you lose.
The last letters are cut off on the long words, so I keep winning on "Miserabl" and "Whirlpoo". Also, just once, I pushed "A" as my first guess and it said "You Win!!"