I've enjoyed the Steam Demo, But i have been hindered by a few aspects,
1. Burning Slag takes WAY too long, if there were a object that could be placed, and would heat up whatever item was inside of it, like a heater, that would burn slag, incinerate objects like spores, or other items, and melt ice/snow, it would help greatly.
2. Sand, Sand is Impossible to automate reliably. I would enjoy a drill of some sort like Hydroneer that slowly drills sand out of whatever you place it on. Like bedrock. And outputs it to the side. Like a drone, but more reliable.
3. Faster Conveyors/Factory Items, My whole factory is being backed up just because the Shakers and the Conveyors don't move fast enough. Having a feature that has multi-staged building, like upgrades that cost $. They would make something faster, and would apply to every building of it's type.
4. Jet pack improvements, When hovering, if the S key is pressed (Pc) it should allow you to hover down. Also, walking up a 1 pixel block or higher should be possible. as hitting little spikes on the ground can be frustrating. Also, a character Improvement is imminent, Even a small walking animation is appreciated.
5. Slight map improvements, Small things like making the map a bit longer, and maybe adding a little procedural generation.
6. EDIT, Events, like rain, any exposed objects, if can be watered, will be, also comes with a new item unlock able in Refining 3, collects water during the rain event, and spews it out as usable water.
Even if 1 of these features were added, the game's quality would be WAY better.
Signing off, -Hfistegt