I think it's less about the $4 dollars and more about the fact that you're charging money for a game that should be free with the quality seen here.
I spent $4 dollars that I will never get back on something that is effectively jpgs of shittily drawn imps and catgirls with the occasional animated jpg.
On top of that, the idea is not even close to original and there are atleast 2 or 3 other games, namely Cloud Meadow or Breeding Season, that are they themselves not finished, and yet look and play 10x better.
The fact that you call this heap of code complete makes me laugh. $4 is robbery for this "product".