Very nicely done, Florent! Very visual and effective!
Two random thoughts if I may.
Rhythmically I’m hearing 4/4 time, correct? The brass towards the end are hitting on 1, the and of of 2, and 4. That’s fine but I’m thinking its also predictable. In the situation where a volcano is erupting there is (or I assume there is) a fair amount of chaos (e.g. when is the next explosion, the next flaming boulder landing on my car, even a racing heart beat).
The eighth note subdivision I’m hearing in the stabs at the end is 3-3-2 | 3-3-2 | 3-3-2 …
What if you used something like 7/8 where you could alter the subdivisions less predictably?
In 7/8 maybe trying 3-2-2 | 2-3-2 | 2-2-3 | 3-2-2 … with heavy accents / hits on each grouping of 3. For me, the uncertainty adds to the tension.
Second – I like your harmonic choice of minor seconds. I’d like to see it even fuller with more notes to choose from. I’ve used the augmented scale which gives you more clusters and dissonance to choose from as you build tension.
The most effective description I’ve heard about the augmented scale is it is built by stacking two augmented triads whose roots are a half step apart (e.g. a Caug over Baug). The resulting scale would give you C-D#-E-G-G#-B to voice in various degrees of dissonance. It’s only a six note scale but a world of possibilities and a great color!
Again, nice job, Florent!
Take care! Stay well!