I know! I can't wait to add that stuff! I just don't have a good setup for the sound yet, and I needed all the time I could get for the mechanics.
The Build button is not actually a bug, that's the pathetic "you won" placeholder. The plan was to have to get enough minerals and cash to build the different stages and get to see the rocket being built in the background, but that never happened, so hitting it once "wins".
I'll be uploading some more builds as I get that extra stuff in there!