The sound in my basement is... a cultist opening a gateway to Hell!

I've been away for a bit but hopefully I can manage my first full set of Pixelween entries since 2020!

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Drawn as my first entry for Pixelween 2023 as well as the 25th September 2023 Pixelween 2023: Sounds from the Basement weekly challenge.

Challenge rules:
Canvas Size - exactly 140 (horizontal) x 80 (vertical) pixels.
Colours - From the given palette only (max 8).
Animation - No.
Transparency - No.