This is a paid asset, but now you can download Cartoon Explosions FX for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Cartoon Explosions FX v1.5
The package includes a scripted system for animating sprite explosion effects, and three extra example explosions that can be customized very easily.
+ simple size and duration scaling,
+ specialized components for editing explosion core, ring, shockwave, text, bubbles, and sparks,
+ wrapper over Shuriken Particle System,
+ advanced editor controls for customizing animations,
+ 15 cartoon explosion texts,
+ 4 custom sprite shaders that provide double coloring and hollow shapes,
+ 11 sprite shapes that can be used to customize explosion components and particles,
+ suitable for mobile and desktop,
+ intended for 2D games.