The story of the protagonist, Frank, a severely mentally challenged young man finding his first friend in the form of an alien is one of the most moving stories I've seen in a long time. Their growing bond is heartwarmingly intertwined with their very different lives, remember to have a box of tissues handy before watching.
In this masterfully crafted film, especially with its budget, it covers the meaning of existence, friendship, loss, growing up and the descent of two friends down dark paths, with some very moving narratives within. Moreover, Brock Lee is easily an amazing supporting actor.
I recommend 10/10, please watch ASAP, you will not be disappointed.