Crafting the panels requires some more specialised materials, so I've added Tungsten, Rutile(Titanium) and Bauxite(Aluminium) ores to the world-generation (Left picture).
Also I've made the day-night cycle seasonal now, so the sun only gets up to 30 degrees elevation during winter (70 degrees in summer). This affects the outdoor temperature, so during cold days in winter, the temperature could drop below freezing, which means your plants could die and your water tank to freeze up (no drinking water). There is a "temperature controlled tank" added already, so you could use that to keep water (and beer) at a nice 5 deg C all-year-round. This specialised tank is also used to keep molten glass at 1400 deg C, otherwise it becomes solid and not usable until it's melted down again. This molten glass can be "rolled" into panes to make windows for buildings and 6 panes to make a glass tank to store liquids.
Going to be adding Fences next (ish). They'll act as a barrier to keep in animals (not added those yet!), but also could be used for decoration. At the moment, colonists just find a path through the buildings and machines, but you could use these fences to guide them a particular route, or at least keep them away from certain areas... or as a form of protection from any future "bad guys" I add.