Inital idea for a new horror movie

A normal boy Tom was travelling to college on the bus as always. Then one day he sees through the windscreen coming towards them a lorry on the wrong side of the carriage way which they inevitably crash into (or we assume) as the next thing that happens is Tom wakes up on the now deserted smashed bus in an unknown location. As he gathers his bearings on what has happened a hooded figure enters the bus and starts walking towards Tom, Tom then looks for a way to escape and as he is about to try something drastic to escape the hooded figure speaks to him (not revealing his face) in a crisp cold chilling voice and explains that he is in limbo and that to save his friends on the bus he must complete various challenges testing his morals and integrity. He then completes gruelling task by gruelling task as he believes he has completed the final task the hooded figure then appears, to gives him one final challenge he must either sacrifice himself here and now to guarantee the safety of everyone who would be involved in the crash or enter back in his reality and chance whether the crash will happen by being decided with the flip of a coin. He chooses after much turmoil and anger towards the hooded figure to sacrifice himself. The hooded figure recognises this as true proof of his morals and sends him back but with a warning that one day he will return to claim him back to his world of manipulation and games.