Have You played Descending? https://ldjam.com/events/ludum-dare/48/descending

Polishing even further after the Jam: Even if it's just a stacked flipbook FX, with random chances of triggering each element, they will randomly generate different results, thus, the user will barely notice repetitive patterns! Also, the particle system is upscalling randomly the sprites on both axis (I know that's a sin and a crime when working with pixel Art).