What went wrong in this start up? Part 1

I am convinced that I have no future in this company. I happen to have couple of superiors with characteristics that make any such future impossible.
My CEO as good as is in VC business is not very interested in getting to know technology, how things work, and what does it take to build new stuff, all fine but the problem is that he is heading technology startup company and he does make decisions...
My CTO is obssessed with the delivery of the new products (good thing, most would guess), there are 7 projects, 8 people, and all due to go live within 2 weeks, no chance for anything to go wrong, right!

And so on; my current project is to change look and feel of our Web site. The site has been build in ASP without much of OO components (Java), the philosophy of serving different content to different users influenced whole site. The sign-in process has changed, which influenced registration and subscription, the subscription had to be updated with better flow anyway.
Today with my marketing manager we decided that the flow of the registration does not make sense anymore (effect of different user types functionality) and had to be fixed which triggered adding two pages, and changing few others. The decision was sound from the customer's perspective and from the technology stand point. Trouble is that my boss does not approve of any changes that treaten his deadlines.
Constantly, I struggle with the fact that I am suppose to improve functionality, change look of all pages, yet I should not change the code. We (programmers) find it impposible, but boss do not care. He just wants in the end to stand up to CEO and say "I delivered". Good thing, again, to deliver on time.

What are my options? I already know that all good credits will be taken away from me and my developers (proven many times over last 2 years), I know if I don't deliver on time I may loose my job, I also know that if I deliver stuff does not work perfectly, I may loose my job as well. Delivery of inferior products are not an option, so I have to make decision that certain stuff has to be fixed. As in case of today, and usually, I have to make best decisions, and program fast hoping that it will work and I will finish on time. Bosses have no clue how much work is getting done, they will take the credit for job well done, they will blame me and my departament for any failures. This is our life.