Not necessarily more text, you just need to lay it out a little better. Try grouping them into larger, more distinct paragraphs. Also try adding some more padding to the left, just to make the text a little more central.

Yes, make the logo larger. Better, make it a logo - at the moment it's just plain text. Why not 'spice it up' a bit? Use a nicer font? Add a graphic? Definitely larger anyhow.

When you say does Google 'lose interest', and the end of the day it's just a bot - it's not exactly Stephen King What I'm saying is, so long as you have text and links on your site, Google will spider it as best as it can

What keywords or keyphrases are you aiming to target i.e what searches do you want to get results for on the search engines?