Pretty fun game! I love the idea of playing as a particularly important bit that if flipped crashes everything, and potentially dodging cosmic rays.
One thing that would be nice is having a bit of a learning curve, for example by starting with just the small particles that can be absorbed, then introducing the bigger ones etc. I initially thought I was just supposed to avoid everything.
An alternative control scheme that would be interesting to explore is if the particle just following your finger (but maybe has a limited movement speed), that way you have tight control over the character but still need to think ahead & quick.