I will save you $0.99. Die With Me isn't fun. Don't buy it.
Its genius is in recognizing how keenly we want to believe someone else is feeling as we do right at a time when we're most self-reflective, disillusioned, tired, or alone. Watching your phone die is cause for reflection. "How did I waste the last three hours on my phone? What do I have to show for it?" We're all reflective when we're alone watching our phones die, and we want to believe our times of self-reflection are a springboard to a deeper human connection.
Maybe it's even true. But you won't find it on Die With Me. Your time between 4% charged and your phone dying is very short. You can prolong it by carefully inserting and removing a slow charging cable to keep yourself safely between 2% and 4%, but don't bother. No one else is doing it, and no one has anything meaningful to say in the moments before their phones die. It happens too quickly. Subjectively it feels like your phone dying unlocks your deepest self in some way, but if it does it doesn't happen fully enough and quickly enough to share it and make a human connection before it's completely dead.
I like the UX design of Die With Me, and it is genius in its recognition of what we want from this lonely experience we all share, but despite that it can't give us what we want. You won't fall in love on Die With Me.