"About "land on one foot on the ledge": I could make something else instead of that, sure. That's really sucks. Seems like I didn't have enough creativity for that."
I don't think this is bad per se, precise platforming can be fun! It just needs a bit of refining imo - even making movement speed slightly lower when we are falling would make it easier to land precisely where we want. But ultimately it's up to you to decide - I may not be the target audience.
"About indication: I tried to make it notable with this "?" sign. If you come closer - you'll get killed. Maybe I should've changed distance for it's to show up."
Question mark is visible, but why are we dying when it sees us? That has to be cleared up. Player should know what and how killed them.
Good luck!