Fun, great game. A few thoughts:
1. The production of power seems to be difficult to understand. I can build dozens of those green generators, and yet it refuses to give enough power to the 3 way splitters or travel any sort of useful distance.
2. I'm also confused on how to get materials OUT of your base. Things you can build with seem to disappear alright, but what about trying to refine coal and iron into steel?
3. It can be hard to distinguish iron and steel and such similar things. Maybe make mined iron red. Also little arrow directions, maybe in yellow, on top of the conveyors would really, really help people design. Sometimes it doesn't want to place in the direction it said it was pointing.
4. Additionally, I'm not sure if it was intentional, but if you point the conveyor arrow left, and drag from the opposite direction, it seems to force it to point that direction instead, so maybe make sure the pointer adjusts to the direction you drag it?
5. Iron production is too high, or coal is too low. If you build 2 iron and 2 coal mines, you'll end up with a solid stream of iron clogging up your distribution points and conveyors around your steel refinery. I like to make a recirculation loop to keep the iron going around and letting the few coal in, and distribute it out to another line which just goes to the base where thousands of iron sit unneeded.