Yes, there is - I actually completed all the levels after this game was released. I was so tense during parts of it that I literally gave myself a muscle spasm in my shoulder.
I found
some tips here that might be of help. There might be some tips on the Big Fish forum for the game, too.
I don't remember specifically about upgrades, but I found this on the Big Fish forum:
How far along in the game do you have to get before you can buy upgrades? That option is still grayed out for me and I am in the middle of week 3...
You have to earn enough money over the goal. So if the goal is $720 and you earn $750, then you have earned $30 towards an upgrade. I believe that the cheapest upgrades are $800. You won't be able to upgrade until you reach a profit of $800 or more.