I stumbled upon this but I could see this as a crazy tool to use in the future there are a handful of features and fixes I would suggest off the top of my head. Firstly, a variable voltage source and wider ranges of power would be cool. Secondly, there should be some sort of component maker, kind of like logisim which would reduce the need to manually add the components and could allow people to add their own. And the rest, I feel like other people had covered better.