Oh wow, that is a complete game changer. That's a very neat mechanic, and you've got many simple components that together make a challenging game -- I would've been missing out on a lot without that critical detail. Now I understand why the first person below said it reminded them of Celeste!
I wanted to come back and say I finished all the levels but there is no way I'm passing this one. I saw those spikes on the right, haha!