Just giving people points isn't any reward. After all, that's just a number on screen. You have to reward players with something more tangible, like a special animation playing or something, or better yet progress to a new part of the game.
Umm, no one said that the game wouldn't give you some kind of reward as you described. It doesn't right now (except for the points), but that doesn't mean that I can't put it in there. In fact, I had a few ideas already but I didn't implement any yet because I wanted feedback on what was there now. I had already thought of adding in special bonus rounds.By the way, if you complete the puzzle, you aren't just awarded 10,000 points, you are awarded 10,000 points times the level number. In other words, a correct answer on level 10, would earn you 100,000 points.
Also, the game does increase in difficulty as you progress. It not only gets faster, but the puzzles get harder.
Please try out the game for yourself and tell me what you think.