Talk:Love Key/@comment-33542560-20171102011759

You can also get it using only the dash from the Crystal Heart, and Mantis Claw. There's a small section of wall above the acid with just enough room to let you start a dash. Spam jump when you hit the other side. There's not much room for error but it's doable (took me 3 tries).

I presume you can get back the same way, but simply falling into the acid after getting the key will teleport you back to the other side.