Theme was used very well, great idea! I only understood that I have to survive until the kraken appears when I read it in the game over screen. Before I did not know what the goal was. Maybe make it very clear what the goal is and give rewards on the way. The kraken healthbar was right next to mine in same color. That was confusing. Fullscreen in chrome was broken. I also wanted to get back to grandma in the end since it was so important in the intro! :D Good job!