Thank you so much for playing, I'm glad you enjoyed it! You're not the first person to mention about the damage so I'm definitely going to have a look at ways of improving that yeah.
Regarding dropping down ledges, in the full game all long "vertical" sections will have ropes yeah (or something similar) - the idea is you will be descending into the unknown, but you won't be forced to jump/fall and potentially take damage. In that demo level the last "ledge" is a blind drop yeah - which is a bit of a mean thing for me to put in, but I wanted to make sure the player couldn't get back up :D
Thanks again for playing and for the feedback, it's all very useful!