In this video demo, I've attached lights to each of the 'items' in the level. The final product will have lights that cover more area, that can be in different colours, and that can also move or flash.
The demo also shows a little bit of the editor being used to place items, and the player moving around with gravity switching directions
To do the lighting, we first do a render pass of the level (to a frame buffer) with just the lights. The lights in the demos are just circles/ovals that face out to the edge. I used an additive blend to blend the lights together, which I quickly tested using this handy tool.
Click video to view fullsize
I also made this woman on a bike, which I also posted on my new Tumblr page
And finally, here's a good set of videos on starting to develop games, called YESDEV0