Cool concept: ghosts of failed attempts that can serve as stools! But not primordially useful in the sense that dying isn't central to game progression, and that you bump into and get pushed by all the ghosts really hard, which can be a hindrance in some cases.
I like the illustrations and Miko's portraits. This artstyle is fun to look at.
The gameplay... I think it's kind of messed up.
Most of the time it's either: my jumps get ghosted (me press Space but Miko no jump), or Miko interacts very weirdly with terrain (walljumping on the ground, inconsistent dying to side of spikes, inconsistent walljumps, Miko gets stuck in a "non-walljump" state when she's hugging a ledge (which means I can't walljump even though she should be), Miko somehow gets stuck on the ground... )
I meant to do a no-death run of the game but that got really unfun.
So instead have some footage of my no-death attempts, where I'm getting bullied by the game - I hope it'll help you troubleshoot issues and polish this otherwise nice platformer.
P.S.: Oh yeah also why is "Delete Ghosts" on [Backspace]? That's so far from [Arrows] and [Shift]. Couldn't it have been put on [Z]/[X]/[ctrl]?