Thanks for the feedback! Difficulty is a difficult thing to tune, as it turns out. Even more so because it's hard to see your own game with fresh eyes.
My (privacy-friendly) analytics system is telling me that there are about 40 games won to 650 games lost. Maybe that's a little low? On the other hand, many of those lost games would have been people playing for the first time. Tricky.
At any rate, you've convinced me to add a "Creative" mode to the Steam version! No rent, no deadlines, just building!