The physics engine is fine and tracks modelled well as advertised. Its fun to drive. But you can finish the whole game in around an hour and there is nothing left to achieve. The fact that you can only race against a single cart severely limits replay value and beyond two cart choices you cant tune anything or race in/against faster machines. So many games out there with poor game engines, here is one with a great engine only they forgot to write an actual game around it. It plays like a functional alpha test build used to verify track layouts and physics. No opponent skill levels, no career, no field, no achivements, no mods, no other carts.
After playing the free version I had such hope but the full version offers little more than track variety and a single (dull) opponent. And "track variety" is generous since all are layouts inside the same (accurately modelled) indoor facility. They could really turn this into something... maybe the next version...
SG iX about Go Karting