Oh wow. Everything about this is so well done.
I finally managed to beat it at around 65-35. Even after Wendell stole all my points. I think it was the end? He just repeats the same stuff about how he's not playing. I was fully expecting him to rage quit and close the game when I beat him though. Beating him by 30 was actually quite a challenge. I guess that means your AI is better at this game than I am. Being able to get points when both of us died was pretty handy.
The variety in the ways he breaks the rules is crazy. It was exciting every time I saw him cheat in a new way. I especially liked the ways where he broke the rules, but you could still win. Like when he fires a millions shots, but you can still win. It felt great to have him cheat, but then still kill him. Wasn't as big of a fan of the times when you couldn't win (like when you couldn't shoot or he killed you before the 3 seconds were up). A small tweak to remedy that could be to have a time limit to all the game so when he cheats and you can't win, you can still win by surviving. But at the same time, it does make sense for him to have some cheats that guarantee he wins, just that it can be a bit frustrating for the player. A delicate balance, to be sure.
I can tell a lot of polish went into this. Like the bullets hitting the walls and moving them, all the walls bouncing when someone died, Wendell's faces and the text box were all superb. Some of them are pretty small effects, but they give the game so much life.
I'm pretty sure everything I could nitpick about this are just things that were probably already on your list to change, but you ran out of time.