Nice work with Coalheart! The art is the standout for me. The pixel work, the torchlight vignette and the face that looks confused when you bump something solid all have real charm. One idea per room teaches well, the over-par note hinting at a shorter route makes me want another go, and free undo and restart are exactly right.
A few things I noticed. The room is drawn small in the middle of a big empty canvas, about a third of my window width, so the tiles were tiny. Par counts every step including walking, and I finished First Ember at 13 vs 11 and Two Runes at 20 vs 18. The early rooms felt more like tracing a route than solving something. I wondered if par could count only bumps. In room 1 I got stuck because I didn’t realize an empty torch tile is solid and blocks the path, so a small visual cue would help. Rooms unlock strictly in order, so a skip or a hint after a few restarts could rescue people who stall.