Thomas Ringdal’s review published on Letterboxd:
Finally managed to get around to it, and taking into account how much of the all round product he's responsible for here, "J'ai tuè ma mere" is really something.
In his debut, Xavier Dolan takes all our inner thoughts (well, at least mine, and hopefully a few more?) at one time or more during adolescence and turns them into dialogue between mother and son, son and teacher and son and boyfriend, and breaks out with a brilliantly acted (Anne Dorval and Suzanne Clement especially), desperately sincere, realistic and for the most part well filmed coming of age drama. I really connected with a lot of the conflicts between mother and son.
Yes, the framing, a mix of different montages echoing a need for artistic expression, are a bit hit and miss, but some of them are really great.