I didn't like how non chalant the MC was when dying. It's all fun and games when he dies... he just simply wakes up. But the elf was there with him. What happens to the girl in that dangerous situation? He had no idea nor did he really seem to care. I also understand that he didn't truly feel his dream world to be a real place since he couldn't bring anything back. But surely he would have felt some consequences to his actions. The elf girl may not have survived and he would never see her again. The way he reacted to her likely death made me think that he's a psychopath.
Also, how does time difference work? The first time he was there, surely he would have been afraid of dying. He might have survived for weeks on in the dream world. Did he go missing in the real world? Or is it that he only sleeps for x amount of hours regardless how long he spent in the dream world before dying.