I really enjoyed this base concept, but inevitably things always crawled to a stop with developing biomass. Might be a skill issue, idk lol
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It depends on which skill tree you go down; e.g., the nitrogen skill tree is somewhat harder due to having a limited supply (since nothing really regenerates it). CO2 should be easiest since many disasters produce it. There are tooltips when hovering over the base skills that sort of explain this (but don't state it explicitly).
And I didn't go that deep into balancing, so it might just be a balancing issue 😅