I must agree with dsurpint about slow pace of the game. But still it's quite fun and chalanging - nice usage of classic logic mechanics. I think that there should be less levels. The game is changing every 3 levels (3 levels in a row are too similar) - so 55/3=20 levels max...
There are subtle differences like in the later levels the houses with wishes appear sooner.
Also the distances between houses is smaller and Santa speed is higher.
There is indeed a big problem with the flash version of the game because the game originally was made for mobile - portrait mode. So the distances and speeds in the flash version are not balanced.
I will upload now a new updated version with some improvements and bug fixes.
I believe the new version feels more like mobile.
The challenging levels start at 30.
It is fairly well done, but the game itself gets boring rather quickly.
Thank you for feedback.
The game is slow paced in the begging to introduce the player to the unusual mechanics. The later levels are quite challenging and entertaining.
But I think it's a matter of preference too.