Some things

Assets/Scripts/BalanceCanvas.cs

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+using System;
+using UnityEngine;
+using UnityEngine.InputSystem;
+using UnityEngine.UI;
+
+public class BalanceCanvas : MonoBehaviour {
+
+	public static BalanceCanvas instance;
+	
+	[SerializeField] Canvas canvas;
+	PlayerInput _playerInput;
+
+	public Action sliderChangedCallback;
+
+	[Header("Sliders")] 
+	[SerializeField] Slider speedSlider;
+	[SerializeField] Slider deathForceSlider;
+	[SerializeField] Slider jumpSlider;
+	[SerializeField] Slider accelerationSlider;
+	[SerializeField] Slider jumpCancelSlider;
+	[SerializeField] Slider gravitySlider;
+	[SerializeField] Slider coyoteTime;
+	[SerializeField] Slider bufferTime;
+	
+	// Start is called before the first frame update
+	void Awake() {
+		instance = this;
+		
+		_playerInput = new PlayerInput();
+		_playerInput.Gameplay.Cancel.started += CanvasStateSwitch;
+		
+		SetupSlider(speedSlider, nameof(PlayerStats.speed));
+		SetupSlider(deathForceSlider, nameof(PlayerStats.deathForce));
+		SetupSlider(accelerationSlider, nameof(PlayerStats.acceleration));
+		SetupSlider(jumpSlider, nameof(PlayerStats.jumpForce));
+		SetupSlider(jumpCancelSlider, nameof(PlayerStats.jumpCancellationMultiplier));
+		SetupSlider(gravitySlider, nameof(PlayerStats.Rb.gravityScale));
+		SetupSlider(coyoteTime, nameof(PlayerStats.coyoteTime));
+		SetupSlider(bufferTime, nameof(PlayerStats.bufferTime));
+	}
+
+	void SliderChangedCallback(float arg0) => sliderChangedCallback?.Invoke();
+
+	void SetupSlider(Slider slider, string valueName) {
+		slider.onValueChanged.AddListener(value => {
+			PlayerPrefs.SetFloat(valueName, value);
+		});
+		slider.onValueChanged.AddListener(SliderChangedCallback);
+		slider.SetValueWithoutNotify(PlayerPrefs.GetFloat(valueName, slider.value));
+	}
+	
+	void CanvasStateSwitch(InputAction.CallbackContext obj) {
+		canvas.enabled ^= true;
+	}
+
+	void OnEnable() => _playerInput.Enable();
+	void OnDisable() => _playerInput.Disable();
+}