Well again, it's very quirky
and since it's PTA, the quirkiness is definitely more than a bit self-conscious. I appreciated the weird/unexpected factor but like I said, it did sorta seem like an ending from another film entirely and I do feel like there were probably better endings PTA could have come up with.
I thought many of the scenes involving Manville's character (who was great btw) were pretty amusing (albeit in a dark and somewhat stilted manner to match the film's tone) but yeah I wouldn't classify it as a comedy either. Just your classic freaky love story.