add buffs

src/game.js

@@ -1,11 +1,13 @@
 import { EventEmitter } from 'node:events'
 import Ability from './ability.js'
+import Buff from './buff.js'
 import Entity from './entity.js'
 import Projectile from './projectile.js'
 import Terrain from './terrain.js'
 
 export default class Game {
   abilities = Object.values({...Ability})
+  buffs = Object.values({...Buff})
   averageTick = 0
   currentTick = 0
   entities = []