Looks good, mechanics work and seems like a lot of effort went into it. Unfortunately, after I snuck past the first 3 guards and went through the tomb area, the game almost completely freezes up and the fps drops below 1. While mashing the keys I managed to get the character back into the tomb area and the fps immediately returned to normal. So maybe check something wasn't messed up in your export? I might try on a different pc later.
Still, from what I saw I liked. The main character's psychotic driving gave me a chuckle in the intro cutscene.