So bugs first... I have encountered only 2 so far with one not really being a bug + one thing that is uselles:
Bug 1: Sometimes when I have my bots running for a loooong time and they go a bit further so I don't have them on my screen they stop doing their work... just stand... I have to teach them the same thing for them to work again.
Bug 2: The one that is not really a bug... infinite stacks of items... I have 4 huge metal and 2 coal stacks in my base and they are blocking the view a lot so I'm trying to put the items into storage...
The uselles Thing: Seedlings... like... why? I have to use fertilizer and seeds to make... basically more seeds??? The tree seeds are Seedlings but... well better as they just drop from trees... thats it.
Idea 1: Glass. Can be used for flasks and windows and what not.
Idea 2: Buildings: Buildings can be build and walls can be build on top of each other then maybe you could get a second floor and use (another idea) conveyor belts to transport the items onto the second floor! (or just use bots and stairs...)