We'd been hesitant about this decision for quite a long time.
Since we are seriously lack of time to fix the demo to a standard of current version; On the other hand, we had not changed our mind on always to share a free demo, so more people could enjoy our work~
However, after some days of observation, it seems that bugs in this demo has been kicking new players away from Bullet Sorrow VR (thanks to the remind from ID: yngndrw).
So we think we just have to cancel the demo for a short time, and it will probably soon be back around April 15th, right after a comprehensive optimization.
Thanks for the concern.