Didn't know there was a "Half-Life" collab coming up. Well, we have collabs of everything nowadays. I just love this huge Mario reference. Everybody's played Mario! I at least know about Gordon Freeman. Kind of sounds like Morgan Freeman.
The animation was wonderful. It looks exactly like Paper Mario. It replayed, but then it showed the credits over. You rarely see a collab part this good. Always good to know how much effort is put into something. Even the bugs are cute.