Added project

Platformer/Assets/Scripts/BuffEmitter.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class BuffEmitter : MonoBehaviour {
+
+    [SerializeField] private Buff buff;
+
+    private void OnTriggerEnter2D(Collider2D other) {
+        if (GameManager.Instance.buffReceiverContainer.ContainsKey(other.gameObject)) {
+            var receiver = GameManager.Instance.buffReceiverContainer[other.gameObject];
+            receiver.AddBuff(buff);
+        }
+    }
+
+    private void OnTriggerExit2D(Collider2D other) {
+        if (GameManager.Instance.buffReceiverContainer.ContainsKey(other.gameObject)) {
+            var receiver = GameManager.Instance.buffReceiverContainer[other.gameObject];
+            receiver.RemoveBuff(buff);
+        }
+    }
+}
+
+[System.Serializable]
+public class Buff {
+    public BuffType type;
+    public float additiveBonus;
+    public float multipleBonus;
+}
+
+public enum BuffType : byte {
+    Damage, Force, Armor
+}