Cyanobacteria says "produces oxygen at a ready state", but no matter how many I build oxygen keeps going down.
If there is no way to get oxygen, I wouldn't call this game "relaxing", as it is basically playing against a deatch-clock, while resources are very scarce and even the building area gets clogged up. Without oxygen production it feels more like a frantic survival horror resource management game.
Maybe you could add some relaxing mode in which the cyanobacteria actually do increase oxygen.