way to tier 4 is way toooooo harsh! i idled for 2 days and got only 2 gens of 10. and the cost of each gene is incrementing. moreover, the game crashes cause of memory overload every day. seems like i have to grind for over month to proceed furthermore.
the hub upgrade cost growth should be weakened A LOT. such as, not like base*mult^level but base*level^(2+0.1*level). and the hub should have a feature to increase the collecting speed of energy. and there should be upgrade that increases specific building's max energy or transportation speed. several teleporter or logic units(such as and/or/not, or particle sorter unit). also it would be a good idea to add drone(like crawler but can fly), or connecting the nods each other like web.
meanwhile im still enjoying this game. interesting concept! just need some balancing. the tier 1 progress is possible on one sitting, to tier 2 need some days, to tier 3 is bit grindy. till this is acceptiable but to tier 4 is, as i said, too ridiculously long.