A particle system made with Unity's VFX Graph.
Some textures I use are made by Luos and are available for free. Animations are from Mixamo. I also use a Mesh to SDF baker in realtime from this repo: https://github.com/aman-tiwari/MeshToSDF.
https://realtimevfx.com/t/unity-vfx-graph-alien-morph/10829/9
Version: Unity 2020.1.0a11
Feel free to reiterate!