Nice platformer with good difficulty progression.
The geiger counter mechanic is nice.
If you ever want to add a sound effect this is how I did it:
https://github.com/Paspartout/radiorob/blob/e1f3505e3eef3417a908b9b8b19587bef98c...
Each frame in you decide randomly with the probability as the amount of radioactivity to play a tick sound. Was really easy to implement. Should be easy to do in unity as well.