It is a nice idea! The movement of the particles was a bit discontinuous, but I enjoyed the art style :D
By the way, after the death controls don't work anymore (at least on the linux version).
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You should press R to restart, does that not work? I just uploaded a WebGL version too.
For the particles, did you notice something in particular? I’ve seen some occasions in which they seem to slightly jiggle in place when playing by myself, but not always. I assume it’s something to do with the physics engine’s collision handling, may be fixable if I tune its parameters properly.