Quite enjoyable.
I picked this up due to the Genterprise name and like most Genterprise games, Clash King is easy to get into.
You start off with a couple of cars and compete in a variety of races/events over a number of different areas to earn money which you can then use to buy new cars (and if you save up enough, a tank) or improve a car you already have.
All vehicles have a boost bar which functions like nitrous and the way to increase this bar is to crash into objects and other vehicles. If you crash into enough cars you can create a chain explosion which nets a large points bonus.
There's a reasonable amount of depth for a game that's essentially pick up and play and I've found the game quite enjoyable and addictive as a result.