At the moment, the game ends just through the exit, and yes, now the key has a bright blue color. Succubus has two capture animations, blowjob and reverse rider, funny thing is, in the previous version, the exit didn't work at all. Days don't mean anything and the difficulty just changes the enemy's speed (the game won't punish you with the end of the game if you stay too long).
Everything in the game is 6 scenes
Bed
Table
The nurse (one scene)
Headless body
Two grapples with a blue succubus
It's a shame that the author decided to give up on the engine, he could have got a good project.