use auto-incremented IDs instead of UUIDs

src/game.js

@@ -11,12 +11,12 @@ export default class Game {
   averageTick = 0
   currentTick = 0
   entities = []
-  height = 10000 * 1.6
+  height = 1000
   projectiles = []
   secondToSlowestTick = 0
   terrains = []
   tickRate = 30
-  width = 10000 * 1.6
+  width = 1000
 
   #behindMs = 0
   #currentTiming = 0