Not much time is required to get through the levels since each level only takes a few minutes to complete and there are not many. The replayability comes from the difficulty spike with each new world, and the fact that there are plenty of items and abilities that can be unlocked and adjusted for each new run through. Along with this the co-op aspect makes it a very enjoyable game to spend an hour or two playing with friends.
Overall this game is not very enjoyable for long stretches, but is at least playable after an adjustment period. For the price of $9.99 that it is marked on the Nintendo eShop, I personally would not suggest it, but if it is ever on sale or if you feel that it is exactly the type of game you would like, it is not the worst way to spend your money.
Overall, Candleman is a wonderful experience for anyone who enjoys platform games or just great artwork, even in a simpler form. It is a cute and inspirational game that is easy to pick up and play through a section as needed, or binge it all in one sitting.