It isn't that bad, but you shouldn't bite more than you can chew. You should focus on main ideas, so that you will have time for testing (for example. animating must have taken much time and effort, as well as changing art on main menu. I like the idea that in co-op both players can stay on eachother (maybe you shall use it to make some puzzle-thingy in your game?) Overall I really like the concept through.