A tl;dr translation from my friend.
If he's wrong, I have some killing to do

-Kogasa's definition is not-so-clear for ZUN
-ZUN ran out of booze drawing Kanako
-Apparently ZUN likes Touhou Mahjong.
-UFO is a homage to Space Invaders
-Makai UFO is the same as Makai PC-98
-ZUN likes Bomberman Touhou
-ZUN is colaborating with Tasofro again for a game
-ZUN says that Tenshi... wasn't her design. The original SWR boss was supposed to be a nekomata. He was taken by surprise with Tenshi.
-ZUN said that he planned to do an original third playable character for UFO, but ran out of ideas and used Sanae.
-ZUN dislikes killing games (FPS, etc)
-ZUN likes Mario Bros.
-ZUN wanted Suwako to appear in 12.3, as wacky as she is.
-ZUN forbids Ryukishi07 to draw Touhou
-ZUN ignores all ideas coming from outside of Japan
-Marisa B is UFO canon end.
-ZUN says that Kaguya and Mokou are too "powerful" for a fighting game.
-ZUN is now disliking the Touhou doujin world (games, doujinshi, etc).
-ZUN is annoyed at people saying his drawings are bad.