Functionally speaking, "δΌε" is more appropriate than "ηε", because the work of so-called game designers is often not truly "design" in the real sense. (This is similar to the situation in animation companies, where the role of supervisors in domestic animation companies differs greatly in terms of power compared to those in Japan and the West.) Proposing the initial plan for a game design involves roles that are at minimum senior designers; usually it's the company investors, decision-makers, producers, and senior designers who confirm the plans, and their influence follows this hierarchy: investor > decision-maker > producer > senior designer. (Often, the senior designer is just there to take meeting notes ^^)