Hey, thanks for trying out my game! I'm going to be adding audio soon after I try to revamp the art. Enemies sometimes do 0 damage, because I give them a grace period when they spawn. Thanks for all the kind words.
I took one student-led class in game development, and this is my first game that I created on my own. I am spending around 5 hours a week on the project. I would spend more, but I am currently working a full time job. After this summer, I'll be starting my second year in college, and I'm aiming for 10 hours a week.