The scaling of the levels is fair. I played to the 'mammal' section. Game mechanics reward idle and clicking fairly. I didn't encounter any game breaking bugs. As far as improvement, if the developer considers some pressure and relief mechanics to encourage the use of lower tiers even after progress. Sure, you can keep bumping of the level of RNA or whatever for the doubling at 25x level intervals. I think this game would shine if it took into consideration for carrying capacities and trying to get the player to balance how higher-tier entities consume and produce energy. In ecology, trophic levels are dependent on certain proportions of the organims that exist in a habitate. I would shit my pants to see some work like that be accomplished.
