Thanks for your feedback! I think there are two main reasons for bad graphics quality:
1) We have no artist in our team at the moment (ok, bad excuse, we definitely should have one)
2) Game was originally designed for 800x600px size (for mochimedia), but Newgrounds did not support such a size. So we had to shrink it to 640x480px and lost some details.
Let's see if we can make an updated version with newgrounds compatible size. Also, it would be a really good idea from us to get an artist to join our devel team... :)