Satoshi Kon's last words

Agreed. From the translation:

"It's so disrespectful to to die before ones parents, but in the last 10 plus years, I've been able to do what I want as an anime director, achieve my goals, and get some good reviews. I do feel regret that my films didn't make a lot of money"

I suppose there's just a lot to regret when one is dying, but I'm not projecting anything, simply responding to this: "Ever since we got married, I was so wrapped up in 'Work, work' that I was only able to spend some time at home after the cancer - such a shame."

From the translation I read, it seemed more like he was sorry that he wasn't well enough to say goodbye in person to all of his friends.

I think, after reading ALL of it and not just half of it, he regrets working too much but he is nonetheless happy that he accomplished so much by working. There is a clear distinction and he makes it clear he wishes he didn't work so much towards the end. I think his "work regrets" are more like feeling disappointed in letting others down at a critical time (he takes his working relationships very seriously, too).