Sounds like a cool idea, but if you’re going to tie difficulty to real‑time biofeedback, you’ll need a tight loop that can ingest the signal, evaluate it against a threshold, and recalc the level in milliseconds. I’d start with a lightweight event‑driven architecture—maybe something like an actor system where each obstacle is a coroutine that listens for a “difficulty bump” message. That way you avoid polling the sensor and keep the CPU usage low. Also, make sure you cap the maximum change per frame; sudden spikes can throw off the gameplay. Let me know what tech stack you’re using and we can dive into the specifics.

ECS + coroutines in Unity will give you the fine‑grained control you need. Just make the bio‑input a single source of truth and push a normalized value into the state machine. For the shader, use a compute buffer that you update once per frame with the difficulty metric; the GPU can then blend the heat‑map overlay on the stage without touching the main thread. Keep the buffer size small and reuse the same descriptor set to avoid allocations. That should give you real‑time visual feedback with minimal overhead.