Only LIMBO comes into my mind right now. 2 sections specifically.
1. The part where the spider tries to stab the boy: Maybe there could be some specific dark mass that has arms/spikes and it can grab/stun/damage you.
2. The part where the big heavy boulder crushes you if you aren't fast enough: Kinda overused but I think you get the idea.
In case somehow you haven't heard of LIMBO yet, you should search it up! It's a really good game.
And if you find my ideas unoriginal or you don't like them, it's okay. In fact they're unoriginal since I stole them from an already existing game made in like 2011. However I think you could make something based on them and make it different enough that it feels unique.
Good luck!
(btw, pls add Linux support if you can xD)