Contrast and compare. Star Citizen. 2016. 5 years and $117 million in development. Licensed engine technology. Supposed to be well into Beta, if not fully playable.
Rebel Moon Revolution. 1997. 14 months and $600k in development. Homebrew 3D engine. Not even half-complete; this was pre-Alpha development material resurrected and made operable by some Russian fans who requested it.