It feels like there's more developer effort than gameplay here. For example, the extremely extensive help screens and formula transparency (which are always appreciated), and the upgradable offline boosts up to 2 weeks of idle time -- but both for a game that only lasts about a day and never presents enough of a puzzle to require understanding of the formulas.

That said, unlocking each new era is fun, the simple graphics are quite evocative, and the day/night/moon-cycle work is a nice touch. It's got a number of meaningful walls without ever feeling particularly grindy. Rewarded my time spent.