Trying not to be overly critical, but the three games I looked at seem quite simplistic and the artwork is minimal. Putting a little more time into the artwork should pay off. These recent tutorials on Gamesutra could help:
http://www.gamasutra.com/blogs/author/ChrisHildenbrand/6036/
I agree, the games I've created so far are very basic, and all the art is taken from free clip-art sites. The biggest critic on that so far has been my wife :) I'm (slowly) working on a more substantial game idea, and I've been updating a dev journal on my blog as I make progress.
Thanks for taking the time to look through the games, and for the feedback, I really appreciate it.
Thanks for taking the time to look through the games, and for the feedback, I really appreciate it.