Although not a new concept, as I imediatly thought of "Fluidity" from the nitendo channel on the Wii, it was well executed and is very enjoyable. Nice job!
Intersting, unique, and amazing all with a retro 8-bit style of gameplay. Simple controls with complex puzzles make this a game you could play for a while.
Now for some explainations...
Why you get money for hitting people: Because those people are camping on private property and the owner is paying you $25 for getting the people off. (The owner is probably the guy at the end, which is why you can stay.)...Why you spend hundreds of dollars on ingredients: because you buy the ingredients for ALL the burgers you kick.
Just a trick that you REALLY should try is to always be at eey level with people. this allows you to bump off of tents and trailers while hitting people. also, try to avoid using the condiment bottle and rely more on the tents and trailers. The higehr you are bouncing, the higher the burger will fly when it hits a tent or trailer, but less of a chance of hitting one.