This is a well-executed concept, with a few select flaws. I think that, if you ever ended up porting this to a mobile device, it would be a hit. As a reviewer, I'd like to detail a few issues I had with the game as it stands.
1. While some of the brighter backgrounds work fine, a few of them, such as the cityscape with the bouncing buildings, are a little too muted, causing the beautiful artwork to fade against Tallboy. They're nearly indistinguishable sometimes.
2. The music. It was very, very pretty music, with a strong beat. Gathering food, jumping, and ducking were more difficult because enemies and food often didn't follow the rhythm. It'd be more immersible if you paced food drops and enemies to match the music (which could be really boring and hard or really easy, I dunno.)
3. The ground. For some reason, I couldn't duck very well with the control key and had to use the mouse. The ground, though, is too short and I usually ended up flinging my cursor around the game title and losing track of Tallboy.
Great game, otherwise! Fun!