Simple and has potential. Colour scheme didn't excite me. I found the toggle in the middle of the screen annoying, but unique as it did add a challenge. There were dead spots where I could leave my player for like 20 seconds without a creep coming towards me. All in all a good job in a rough draft state but needs music and I'd suggest a gradual increase in creeps over time, making it harder to survive over time. Just my opinion. Game on!