Well done on the game! I had some issues with the text not being visible, even after moving to full screen. I also got confused that I couldn't use wasd, and had to reload the page to find the instructions again. Overall the scaling is a neat mechanic, but I didn't feel very inclined to use it. I ended up finding a balance I liked and never deviate from that, which may not be optimal, but it did the job. Additionally, as others have commented, the AI was pretty good.
Overall I also think the implementation of the theme didn't add to the game very much, but I am not here to judge in that regard, you maybe a cool game, and thats what matters!