This is a interesting story. Especially, that the grays are human in the future. I looked at some of the other episodes and they are engaging and keep you interested.
I do feel there is some question that you may plan to answer. Like what happened to earth? Is it around or was it destroyed.
One question I have is this, and that is where the story does fall short for me, why does the government need a desperate alien, sorry Human, for this mission? You would think they would have a long line for the fist time traveler. That seems like one thing in the story to clarify. Is it that the far in the future human are not as much a risk takers as the their homosapains ancestors, they are not fixated on getting laid as the older humans were. When we blasted men in to space or to the moon even working towards Mars we had people lined up because despite the great risk and hardship of the trip its worth the prestige of being the FIRST. And if they are just testing would they fist send a probe? And if they need a test subject would they send a dog or a homosapain on a short trip to see if it does damages? I humored my self with the idea that if the protagonist turned his master down his master would say sorry but you know to much and you should have figured that when stepping in this room you enlisted your self and have no choice but fallow my orders. But is there any test pilots they have up front, people that are not underage and already skilled on operating advance vessels. These test pilot can be hand picked from the government without them noticing until they are selected and given orders. OK so he is very smart and it would not surprise me that everyone of those humans are with an average IQ of 250 but still it does make me wonder what there idea of a candidate is.
Well it may be looking too much into it as it is also a comic story. It does have the Dr Who or Travelers guide though the galaxy feel to it. And I still think it is a great animation and story. It is still a fun story to watch and I am looking forward to you new episode.