Kevin Costner and Sienna Miller premiered their Western "Horizon: An American Saga" at the festival
Kevin Costner and Sienna Miller premiered their Western "Horizon: An American Saga" at the festival AFP

A Donald Trump biopic and the latest dark creation by David Cronenberg premiere in Cannes on Monday as the world-famous film festival reaches its midway point.

"Emilia Perez", a musical about a narco boss having a sex change, is the audacious frontrunner so far, after 11 of the 22 entries for the top prize Palme d'Or have been seen.

Demi Moore looks a serious contender for the best actress award after rave reviews for "The Substance", an ultra-gory horror about the pressures women face to maintain bodily perfection as they age.

Deadline called the movie "the year's smartest, goriest horror breakout", while Variety singled out Moore as "nothing short of fearless".

The festival -- considered the film industry's foremost get-together -- concludes with its award ceremony on Saturday, with "Barbie" director Greta Gerwig heading the jury.

Two more buzzy entries arrive on Monday.

"The Apprentice" is a biopic of Trump's formative years from Iranian-born director Ali Abbasi -- bound to stir up controversy in an election year for the United States.

It stars Sebastian Stan, best-known for playing the Winter Soldier in Marvel films. He also won best actor at this year's Berlin Film Festival and widespread acclaim for his part as rocker Tommy Lee in series "Pam and Tommy".

Later, Cronenberg -- director of many body-horror classics like "The Fly", "Crash" and "Videodrome" -- returns to the festival with "The Shrouds".

Billed as his most personal film yet, it tells the story of a widowed businessman (Vincent Cassell) who invents a machine to monitor the dead in their graves.

It was partly inspired by the death in 2017 of Cronenberg's wife of 43 years.

"I don't really think of art as therapy," the Canadian director told Variety. "Grief is forever, as far as I'm concerned. It doesn't go away. You can have some distance from it, but I didn't experience any catharsis making the movie."

Among entries to score well with critics during the first week was "Bird", a gritty but sweet and fantastical tale about a young girl in working-class England from director Andrea Arnold.

"Kinds of Kindness", the latest bizarro team-up between Emma Stone and Yorgos Lanthimos, featured some ultra-dark comedy moments, including a thumb-and-cauliflower dinner.

"Megalopolis", the decades-in-the-making epic from Francis Ford Coppola, has perhaps been the most divisive entry, with some reviewers finding it a profound end-of-life work of philosophy, and others a barely comprehensible mess.

But the one to beat so far is "Emilia Perez", which has earned acclaim for stars Zoe Saldana, Selena Gomez and trans actor Karla Sofia Gascon in the title role, as well as its French director, Jacques Audiard, who already has a Palme d'Or under his belt.

The festival has also seen glitzy out-of-competition launches for two Hollywood blockbusters.

The action-packed "Furiosa: a Mad Max Saga" received largely strong reviews, while Kevin Costner returned to his favourite Western genre with the three-hour "Horizon: An American Saga", just the first of four mooted chapters.

Like Coppola, Costner put millions of dollars of his own fortune into the decades-long passion project.

"At a certain moment I just said OK, I'm going to do this myself. And so I mortgaged property, I raised the money," he told AFP at the festival.

The early reviews were mixed, with The Hollywood Reporter deriding it as a "clumsy slog" while British newspaper The Telegraph said it was "earnest yet hopeful... (and) perhaps its full grandeur won't be fully realised until part two".

Costner says he is unconcerned about risking his money.

"If they take it away from me, I still have my movie. I still have my integrity. I still listened to my heart," he said.

'Emilia Perez' is the current frontrunner among critics
'Emilia Perez' is the current frontrunner among critics AFP
Emma Stone starred in the twisted comedy "Kinds of Kindness"
Emma Stone starred in the twisted comedy "Kinds of Kindness" AFP
Anya Taylor-Joy starred as Furiosa in the latest Mad Max
Anya Taylor-Joy starred as Furiosa in the latest Mad Max AFP
Demi Moore is a frontrunner for best actress for gory horror 'The Substance'
Demi Moore is a frontrunner for best actress for gory horror 'The Substance' AFP