Hi, I did the music for the game. What you should need to do is after you get the can, you hear a loud crash and you have to go into the house to find a portal that will take you to the boss. you need to punch the door down to enter the house.
Took me a while to get back to playing Jam Games but i glad i got to go back to this one. It was super cool I enjoyed the music and the game had a great feel. The bosses had some great mechanics to them and the zombies were a nice touch. Thank you and Good luck.