Wow. When I saw that scenario picker and very nice UI, I could tell this was an ambitious project - very well done. I've played the tutorial level so far, liked it - I'll definitely come back to the rest when I have a bit more time.
I got that 'The Settlers' vibe of not quite knowing what was what, but the tooltips explained all - though I forgot what my objective was - maybe you could put it on the pause menu?