I'll be honest, I didn't fully have a clue what was happening for large portions. Yet, I still weirdly enjoyed watching 'I’m Thinking of Ending Things'.
I think the main reasons for that are the two leads: Jessie Buckley and Jesse Plemons. They kept everything feeling fresh and intriguing to me, both have their moments in this. Toni Collette and David Thewlis also do very well. I like the cast, for sure.
As for the plot, it didn't do anything for me but it did keep me thinking which I appreciated. I, personally, would've preferred a shorter run time and clearer meaning - the latter is just me though, I'm sure others will adore the way the film is portrayed.
Some other reviewers have put it perfectly in terms of matching me: not nous enough to 'get it', but it still comes across as a good film. I'm fine with that, each to their own as always.