Yeah it should be constructive...
KillerIN's review sparks my thoughts. I played through easy to normal and I need up to 4 times to complete a level, and I expect to get more when I play hard. However I still think it's NOT really a game dependent on luck.
Okay, it needs some really BAD luck to lose, but as long as you don't consider "no moves" (which probably require restarting the level if you don't have shuffle) as a lose, this game actually have some really important strategy that will out-shadow the luck parts.
There are 2 points in playing this game (In case you are already familiar with mahjong puzzles):
1. Play WELL before play FAST. I'm not disregarding speed, but some tiles are confusing and a wrong match can dramatically jeopardize your game.
2. Avoid playing same tiles consecutively unless you are in a emergency or the move is extremely helpful (Revealing a lot of free tiles). Remember, a match will eliminate ALL food of that kind on the conveyor belt, so you should leave same pairs for later "belt cleaning".