Sometimes the loading time of the game depends on your PC, but really the game is not very big and it shouldn't take more than 3 or 4 seconds to load the main menu.
On the other hand, the game was made for 64 bit computers. If your computer is 32 bits it is likely that the game will not work.
I apologize for not being able to help you, but I strongly recommend you to contact itch.io support for a refund. I was reading their legal terms and when the buyer can't run a program correctly the company is obliged to refund your money.
