Totally not oblivious, Galaxian completely misses the part where he's supposed to realize that Ark is following him. Then again, maybe it's because this is a graveyard, so it's impacting him quite a bit. In any case, he kind of looks dumb, walking away on his merry way when Ark is basically next to him trying to help.

"Huh?" Galaxian screeches to a halt upon hearing that, making the body he's holding flop like a rag doll.
"Why're you here?" he asks in a perplexed tone, probably because when he heard "Bye" he had been expecting it to be directed towards him as well.

Plot goods, xD.
"You got bored?" Galaxian repeated, his perplexed tone now moving over to his looks. Specifically, he somehow conveys confusion through a blink. "By doing what? ...Never mind actually, I feel like I'm making this more confusing than it actually is. Well. Uh, I guess I dunno where to bury him." He gestures vaguely to the body, which is hard because he's carrying it. 

Galaxian's not being the sharpest tack in the wall right now. He stares at the tree for a while like he's imagining Ark and him talking while walking in circles around the tree--which is exactly what he's thinking. 
"Oh, okay," he goes on, and then he looks at Ark. He's actually waiting for the other to pick up the legs or something. He's not real good at teamwork.

Galaxian hops, trying to get used to Ark's pace with the other's long legs and all. "Encountering a lot of murderers," he says with no hint of humor, though he's being intentionally ironic. "Annoyed just about all of 'em too. A lot of them acted like I stole their wallet or whatever it was mortals use to store their money in." 

"What've you been up to?" He puts slight emphasis on the "you." He's still hopping along. This is...not ideal.

"Nah, that would make us seem like mules or something. Mules are great, but it feels weird to think about," Galaxian says with a straight face, envisioning a mule the same purple hue as Ark's skin.

"Home Depot?" Galaxian shows a moment of confusion. "That sounds fun though, but probably not for him." He jounces the corpse a bit to indicate who he's talking about.
I don't think the dead body cares, Galaxia--ah, never mind, you're not gonna listen anyways.

The life god scrutinizes the grave with his scarlet eye. He's probably suspicious as to why the heck an empty grave is just...conveniently there.

Sounds...sounds legit?
"Do decapitated heads actually stay conscious after 20 seconds?" Galaxian remarks randomly as he heaves the body up again for easy in-ground placement.

"Androids aren't really living though, and I don't wanna test," Galaxian goes. The hole isn't long enough, and he kinda scuffs at the ground with his foot trying to make it lengthier. In the process, he accidentally plops the end of the body he's holding into the ground in a fashion too hard for his opinion and winces. 

The way Galaxian tries to get the arm into the hole with minimal contact seems weird for someone who was carrying a body only a few seconds later. He finds trouble getting it by the other's side, thinking it looks like part of his shoulder is raised unnaturally, and is generally just being awkward again. 

The narrator loves how the description makes it sound like they're in a school AU and just finished a project together.
"Arm..." Galaxian mutters. For some reason, now every pose is looking unnatural to him.

Galaxian makes a doubtful noise and continues to fiddle around. 
Eh, it's just his perfectionism acting out. Give him about three minutes and he'll run out of ways the arm can be put.