I would say that Uber intend for PA to have a fair level of humour. I am not talking Borderlands 2 style pop culture referencing and self deprecating humour necessarily. However given the visual aesthetic that Uber are going for with the blocky and stylised units, exaggerated curvature of planets, swirly terrain and slapping comically sized rockets onto asteroids I would say that PA isn't likely to take itself entirely deadpan serious. It already seems quite self aware, given the style of narration in the gameplay visualisation and I think it is playing to it quite well without being overt. Less about cracking jokes and making overt references and more about the overall tone.