Pretty sure that background image, the watercolour-y figure, is stolen. I'm pretty sure I've seen it elsewhere.
But this isn't even an artist or a dev who's rightfully upset that something they did was criticized. This is like someone making the 1945 demo in GameMaker, doing it badly, and selling it, and then being upset that people don't see the vision. A mismatched collection of random models (Which apparently resemble some in another game, and it wouldn't suprise me if that asset was stolen too), barely viewable graphics, no feedback for ingame systems, and fucking laughable killstreak notifications that they unironically borrowed the inspiration from Unreal Tournament et al. That video is a better review of the content than any lengthy experience could be. That's not the product of someone who's worked hard to learn what they're doing. That's a first mess around with a dev kit. It'd be like calling tooling around in G-Mod "Level Design in Source Engine".
And apparently Jim was playing terribly? He avoided enemies, shot accurately at them. At which point he ran out of ammo (And that game has an extroadinarily misleading HUD) and went to find more, at which point he discovered: The game does not pause (THIS IS NOT A FEATURE. BITE ME DARK SOULS. THERE IS NO POSSIBLE JUSTIFICATION FOR THIS), You only pick up ammo for the weapon you have out, There are landmines that don't work, and apparently that's his fault for having the pistol out (His last weapon that had ammo), which apparently is a terrible gun, and that he was meant to look in obvious places for ammo (Lying on the ground is not obvious. Lying in stupid places on the ground is not obvious. It's common in old games, but that's not something you want to be proud of).
I don't think that he's hurt his chances at continuing doing what he does though, because no-one of any talent or training would want to work with an obvious scam artist. Let's wait for the Streissand effect.