Really nice job on this. Well done.
A few questions/quibbles.
Does Wearying Blast follow the same rules for damaging a sleeping person to wake them up, as per the Sleep spell? (Slapping or wounding awakens an affected creature, etc)
There's a missing [you] in the first sentence of Death Mask.
Poltergeist is really fun, but I don't think I'd spend one of the few Invocations I get on what are essentially cantrips. Something a little more powerful would be interesting, along the lines of Greater Mage Hand & Minor Image.