Fun concept, the grandma is a good asset!
It took me a couple of trys to realise I need to RELEASE the mouse for the slider to take effect. This feels a little unintuitive as sliding/turning a radio dial irl has immediate effects. It was also quite challenging given how fast you lose health and how the frequency changes felt random. I also wasn't sure whether there'd be a win state, or whether it's just a "survive as long as you can" kinda experience.
Please give my game a go if you get the opportunity :)