This isn't the hardest game ever or the most creative. With that said, it is worth the low cost or if you can get it in a pack. It took me a little over 20 hours to beat it on the hardest difficulty and it was pretty fun, but a little frustrating.
The main gaming mode is a match 3 (Or more.), with powerups to aid you. When you win rounds, you get pieces to add to building a "Wonder". Once you build the complete Wonder, you move on to another. If you do it in a certain amount of turns and by following certain rules, you can get 4 stars
The basic gameplay is simple, but fun. It mostly follows the same rules as all the other match games. You get bonus powerups for matching more than 3 and you get additional ones that charge up over time on the side of the board. You will end up needing these often, if you plan to play on timed difficulties.
There are decent mini games and also an area that you can design with the coins you win from playing the game. Other than unlocking mini games and getting achievements, this would be kind of pointless for most people. There is a really fun matching game that can be found here, as well as a building that contains a game to unlock extra powerups.
It is an alright game for the cost. I enjoyed it enough to complete it, so I could never recommend against it. I simply think it is an average matching game, which is good for Steam because there aren't many of them that have achievements. It is a bit of a challenge to beat it on the hardest difficultly, so that will either make you want it more or make you hate it if you don't like the game. :)
Try it out, if you get a good deal on it.