I've been working on an adventure game since June, and I've made some decent headway. So far there's not much to it but soon I'll be working on the levels, characters, items, etc. The art is totally not ready yet as that is not my area of expertise, but if you'd like to help create the art for the game just contact me on my Twitter or by private message here on Newgrounds.
Here's a picture of the tutorial level to show you how it looks right now: