Page 112 - Self-Taught - Boundless Magic - This appears to be saying that self-taught only learn additional spells when they learn a new level of spells "When you gain a spell level you can learn a cantrip or a spell up to your current maximum spell level as shown on the Mystic table." otherwise this would say "when you gain a level" but it was not immediately obvious that this was the case. This would limit Self-Taught to a maximum of 10 spells and 3 cantrips at maximum level and without investing feats into getting more spells. If this is the case it's a reasonable drawback for their other benefits.
Pages 121 - 123 and Page 189 - Witch - General Feedback. (Apologies that this is across two sections of the pdf, and therefore should be in two feedback threads, but I feel that the spell lists and the class features are linked closely enough to warrant feedback of both elements together). The paths give the witch some identity but are not backed up by their limited spell list. The red path reads as a healer, but they are unable to take any healing spells, the white path focuses on spirits but a lot of the iconic 'spirity' spells are missing from their list (spirit guardians is the closest spell to tormented spirits from the APG, speak with dead is 5e's version of Symbaroum's necromancy, etc), the green path is largely about beast shape but the spell list does not include stronger polymorph (or similar) spells and so caps out at CR 1. While some of the path features seem decent if you choose them as your first path they seem rather lacklustre if chosen as your second. The spell list is also reasonable up to and including 3rd level spells but 4th - 9ths seem to miss the mark compared to what witches would have in the original system and compared to other mystics.
(edit as no-one has replied yet)
Page 122 - The table of beast shapes shows the progression for the Max. Cr and Limitations of beast shapes that can be used under the Green Path's 'shapeshifter' at mystic levels 2, 4 and 8. The example given in 'A chosen Path' paragraph above the 'beast shapes' section shows that 'shapeshifter' will be available, at the earliest, to level 6 green path witches - so having a mystic level 2 and 4 option in the table is confusing.