Yeah, I get what you mean. I'm not the best artist around (especially not when accounting for the time constraints), so unfortunately what you see is what you get!
I also agree with the interactivity comment. I decided against having the boss' attacks be button presses, but for some reason didn't think of having the troops button-mapped. I also thought of adding the ability to select where you spawn the troops which would add some more to the decision making, but I ran out of time. In short, there's definitely room for improvement were it to be developed further.
Thanks for checking it out and thanks for the feedback!