Nifft said:
Lesser Invocations:
- Color of Outer Space - Hypnotic pattern, as the spell, at will.
- Light From Beyond - Daylight spell which deals 1 point of Electrical damage each round to all creatures (except you) in its area. Also, the light is a really gross yellow-green.
Color of Outer Space is not a name I would choose for that Invocation- I mean, space itself has no color (unless it's black), and if I were to base an Invocation on the HPL story "the Colour Out of Space" I'd make it more like your
Light From Beyond. In other words, a light that's wholly otherworldly, and damages those that see it.

I think a better name for the
Hypnotic Pattern one would be
Higher Geometry or something like that, the idea being that it creates an extradimensional pattern so complex that when a viewer's eye starts to follow it, they just can't stop- and thus stand there and do nothing while they take in the whole picture.
Light From Beyond is too cool to criticize though.

Very flavorful and perfectly in line with Far Realm lore.
Nifft said:
Greater Invocations:
- Entangling Octo-Phasm (Blast Shape) - Your eldrich blast becomes a many-armed mass of undulating tentacles, most of which are illusionary (composed of shadow-stuff). The target struck by your attack must make a Will save or be entangled for 5 rounds.
- Viscous Walls - You can create one of three wall effects, but you may only ever have one wall in existence at any time -- creating another ends the current one.
- Electrical Membrane: a crackling sheet of electricity, which deals damage as a wall of fire, except the damage is electrical rather than fire.
- Ephemeral Membrane: as illusory wall.
- Esophagal Membrane: a thick viscous membrane which functions as a wall of ice, but the damage caused by hacking through the wall is acid rather than cold.
Entangling Octo-Phasm at first made me wonder whether you had noticed the
Entangling Blast Invocation at the Least level, which causes targets to be Entangled for 1 minute if they fail the save. But then it occurred to me that your Invocation is listed as a Blast Shape specifically- so does that mean your intent was to turn the Eldritch Blast into a sort of Eldritch Tentacles effect? Like an
Evard's Black Tentacles that somehow involves the Eldritch Blast? That's a very cool and unique idea- though a bit hard to wrap my mind around how it should work mechanically. Also- with this,
Chilling Tentacles seems to become obsolete, so perhaps the Alienoid should just have this replace that.
Viscous Walls makes me a bit leery because it can produce multiple effects. No other Warlock "Wall" Invocation can do that.
Nifft said:
Outer Invocations:
- Far Layer - You can bring a thick, pseudo-liquid portion of the Far Realms in conjunction with your current location. This functions as the spell acid fog, except that each round in addition to the normal 2d6 acid damage, the fog-like pseudo-liquid deals 2d6 fire, cold or electrical damage (chosen when you use the invocation). Duration: concentration.
Cheers, -- N
If this Invocation represents actually dragging the Far Realm into conjunction with the Material Plane, it should probably have some cool effects other than just damage- Insanity is obvious, but it's probably
too obvious- and anyway has been done.

Forcing creatures caught within to swim in order to make their way out might be a good start- perhaps this Far-Realmy fog does something strange to gravity within its area. Another possibility, given that the Far Realm usually represents a space beyond known dimensions, is that the
Far Layer causes dimensional tears to form in its area- creatures inside it must save every round or be
Dimension Doored,
Teleported, or even
Plane Shifted to random destinations. That could have
most unpleasant consequences.