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.
Since you're a one man band, I might also suggest you try to copy a successful app on the Android market. Find an app that is relatively high priced that you think you could copy and then sell at a lower price. They've already proven that the market exists. Once you have the app built, then iterate by adding features that the competition may not have thought of.
Thanks. That's good advice on app ideas. So far I've been trying games, and I think apps are a fairly different dynamic, from the development side as well as what drives someone to purchase one. I'll probably try my hand at a non-game app some day.