Fun game
building or moving large ammounts of machines are difficult
also not being able to remove machines is a pain
you could add a inventory where machines removed from the map go so that storing machines works with the changing costs
You could also add a copy and paste feature to make building larger structures easier
Especially when going into late game mana crystal production with the hundreds of machines that need to be connected. Mana Dust also becomes a mostly useless byproduct while silica dust has too little being made.
and hitting the throughput limit on the connections.