Road to the IGF: Zachtronics' Opus Magnum

https://gamedeveloper.com/business/road-to-the-igf-zachtronics-i-opus-magnum-i-

Interview with Zach Barth and Matthew Burns: metrics are cost, area, and cycles; friends' scores motivate optimization; the team deliberately offers no in-game rewards for optimization.

Comparative histograms, Opus Magnum