Quite a good demo there is a bit of a bug with jumping where you can jump out of bounds I was able to jump back though.
I do hope you can expend on making the runs more unique for example adding more random encounters or ways to change up the playstyle per runs to not make thing feel the same, Being able to play as more then one characters can make some cool puzzles like the book puzzle or maybe sacrifice a opportunity from I run to make the next run more powerful.
Loved Odyssey of Gianna and I will be looking forward to the complete version of Blackhold