Nice premise and atmosphere! I really enjoyed reading through the notes and piecing together some of the lore of this world. Really liked the focus on English folklore (I hadn't seen puck/puca in video game before).
I also enjoyed searching for pucas, but found it quite hard past the first few ones (I always had 1 or 2 remaining before either my wand or the detector/orange crystal would run out of use). I didn't quite understand how to use the "radar" (the green crystal), even if I saw it shaking from time to time... Limiting the number of use per item made them feel pretty precious and compelled me to not "spam them", so I thought it really added to the gameplay.
Overall I had fun puca hunting, great job for a 1-week game!