Yes, a “fast kill” option definitely needs to be added to the full game. This would encourage players to experiment with the different choices. That would also allow players to have fast and crazy killing sprees, just like in Death Note. XD
[SPOILER] The attack of the "eye" caused a lot of trouble for other players too. Many of them solved the situation with a screenshot. :D The intended solution is to open the skeleton's note and switch back and forth between the book and the vision with [Ctrl]. The skeleton's note will remain open at the vision screen, and the eye attack will always reset. But I understand, this solution is kinda unintuitive. [/SPOILER]
Thank you for playing!