While this game is diverting and can be quite challenging, the levels are not truly crossword puzzles. They are more like a Fill-in where the list of words is hidden. The only clue to the correct solution is the placement of letters in the various words. This can reduce the player to merely guessing the answers.
Also, there is no timer, or score, or any measure of progress or how well one is performing. This gives the player no feeling of satisfaction besides "OK, got that one", which becomes tedious.
Fregoni about Crossword Jewels™