If you can't load any level and game always crashes, please make sure that you meet the Minimum System Requirements listed on Steam game website.
The most important thing is graphic card with 2GB VRAM. We'll try to optimize this in the future, but right now it might be a problem on laptops, so please check it before buying the game.
If you didn't check it before, already bought the game and found out that your computer doesn't meet the requirements, there is no problem to make a refund.
If you have problem with loading level, try to lower the texture quality in game Options