The game is cool, though it was a bit laggy on the web. But since you mentioned it would be like that, it’s not a big problem.
One issue I had was with the tutorial — you gave a large chunk of text, which is generally not recommended in games. It might be better to add instructions within the game itself, like “find the keys in the barrel” and then later on, “free the zombies in the cage hidden somewhere.”
Also, the robot was kind of annoying. Once it hits you, you either die instantly or get lucky and can run away. Maybe adding a small cooldown between hits would make it more fair.