Some of the shapes look kinda underdeveloped. I'm not sure how, but try experimenting with the textures of toaster guy. The fist looks spot-on, though.

Don't just be done with this if you think it's not very good - i think it's good practice to keep nit-picking on a single piece, even if a lot of us don't do it . 

It's pretty great that your game project has gone this far, great work on it! Don't let this stop you!

lol this looks entertaining. I like it.

I think you need to put the game title (the name I mean) more in the middle of the
screen. with this one you have, the entire illustration makes a
distraction over the entire art. 
I think this piece is amazing for a poster, also the title font is great.
For a game title screen you need to make your game title stay on the primary layer.
Like the news on the newspaper.