Thank you for playing. It's nice to know that the Linux version works! (mostly)
You should be able to zoom with either scroll wheel or "+","-" looks like i never mentioned that in the controls.
Yea rivers are fucked. I spent a long time trying to get procedural liquid / rivers working and I wasn't able to get it exactly how I would want it. I ended up just leaving them as some water dribbling off the top of mountains.
I'm thinking about how/if base-building will be in the game, and that might include being able to dam rivers and change their flow.