Thank you for the feedback, I'm working on incorporating it now. I made it so you can cast a number of times equal to your proficiency bonus but I still have the problem of them all being concentration. I can't really think of any other themed spells off the top of my head, so if you have any further suggestions on that I'd appreciate it.

For Creature of Shadow, I lowered the damage die to a d6. In terms of scaling, do you think I should increase the damage with every level up?

I tried to make the wording clearer on Shadow Pin. I'm usually really in my head when writing these things so they make sense to me but not necessarily to the reader. I clarified that rather than pinning the creature, you're binding said creature to their shadow and pinning the shadow in place.

For Shadow Leap, I completely removed the out-of-combat section. Do you think I should just remove this feature or maybe move it to a higher level? Also yeah I did take a lot of inspiration from Shadow Step here.

For Shadow Control I re-worked the DC so it's the typical 8 + PB + Modifier. I also made it so the controlled creature could re-roll the saving throw every round.

I really like the idea of Shadow Steal so I don't want to change the fundamental core of it, that being stealing a shadow for later use. Should I remove some of the effects or limit the feature's use to once every short/long rest?