I had some fun with this. Initially the little red guys would get to the town before I could place down anything to stop them, and if I stopped the first wave the second or third wave would take me out. That's not a problem, I appreciate the difficulty, but it may be a bit too steep for the initial waves. But once I figured out how to get past the first few waves I was getting so much gold so fast I could just lay down a huge sea of spike circles that nothing could get past. The learning curve may be initially steep but the skill ceiling is pretty low. I'd say the one thing this game needs is balance if it's going to be much of a challenge beyond the first couple of waves. Also, once I started getting sub 20 FPS and guys started spawning in the blue I figured that I could count this as a win, at least as much of a win as I was going to get.


Still, like I said at the beginning, I still had some fun with this. Figuring out how to stop those waves and taking advantage of choke points, although a simple fun, was fun nonetheless.

As @county-agent said, the start is really difficult and then it's trivial to survive indefinitely. I only had a few pixels of health left but survived long enough to cover each tile in both a spike trap and a tower (not sure if you are supposed to be able to, the sprites were flickering like crazy).