diff --git a/backend.js b/backend.js
index 6c1d6ac..a87421f 100644
--- a/backend.js
+++ b/backend.js
@@ -718,10 +718,12 @@ io.on('connection', (socket) => {
 
 
 const ENEMYSPAWNRATE = 1000
+
 function spawnEnemies(){
   enemyId++
-  const radius = 8 + Math.random() * 8
-  const speed = 1 + Math.random() * 2
+  const factor = 1 +  Math.random()  // 1~2
+  const radius = Math.round(factor*8) // 8~16
+  const speed = 3 - factor // 1~2
   let x
   let y
 
@@ -734,7 +736,8 @@ function spawnEnemies(){
   }
   
   // back ticks: ~ type this without shift!
-  const color = `hsl(${Math.random()*360},50%,50%)` // [0~360, saturation %, lightness %]
+  const colorfactor = 100 + Math.round(factor*60)
+  const color = `hsl(${colorfactor},50%,50%)` // [0~360, saturation %, lightness %]
   const angle = Math.atan2(SCREENHEIGHT/2 - y, SCREENWIDTH/2 - x)
   const velocity = {
       x: Math.cos(angle)*speed,
@@ -743,7 +746,7 @@ function spawnEnemies(){
 
   const damage = 1
   const myID = enemyId
-  const health = 1  // default 1
+  const health = factor*2
 
   // (new Enemy({ex, ey, eradius, ecolor, evelocity}))
   backEndEnemies[enemyId] = {
diff --git a/public/js/classes/Items.js b/public/js/classes/Items.js
index 0ca93d6..5b0f052 100644
--- a/public/js/classes/Items.js
+++ b/public/js/classes/Items.js
@@ -69,6 +69,8 @@ class Gun extends Item {
     }
 
     restock(playerId){
+      if (!frontEndPlayers[playerId]){return} // safe - player deleted white recharging may inccur an error
+
       const ammoList = frontEndPlayers[playerId].ammoList
       //console.log(ammoList)
       const typetemp = this.ammotype
diff --git a/public/js/eventListeners.js b/public/js/eventListeners.js
index 16a0d7f..9d82911 100644
--- a/public/js/eventListeners.js
+++ b/public/js/eventListeners.js
@@ -25,6 +25,7 @@ function shootProj(event){
   let currentHoldingItemId = frontEndPlayers[socket.id].inventory[inventoryPointer] // if it is 0, it is fist
   let currentHoldingItem = frontEndItems[currentHoldingItemId]
 
+  if (!currentHoldingItem) {return} // undefined case
 
   if ((currentHoldingItem.itemtype==='consumable')){ // eat
     // dont need to check amount since we will delete item if eaten
@@ -40,14 +41,14 @@ function shootProj(event){
 
     // decrease amount here (if needed in future)
 
-    fireTimeout = window.setTimeout(function(){socket.emit('consume',{
+    fireTimeout = window.setTimeout(function(){ if (frontEndPlayers[socket.id]){socket.emit('consume',{
       itemName: currentHoldingItem.name,
       playerId: socket.id,
       healamount: currentHoldingItem.healamount,
       deleteflag: true, // current version, delete right away
       itemid: currentHoldingItemId,
       currentSlot: frontEndPlayers[socket.id].currentSlot,
-    });
+    }) };
       clearTimeout(fireTimeout);
       listen = true},CONSUMERATE)
 
@@ -192,7 +193,7 @@ function reloadGun(){
 
   reloadTimeout = window.setTimeout(function(){currentHoldingItem.restock(socket.id);
     //console.log(`${currentGunName} ammo: ${currentHoldingItem.ammo}`);
-    clearTimeout(reloadTimeout);frontEndPlayers[socket.id].reloading = false;
+    clearTimeout(reloadTimeout); if (frontEndPlayers[socket.id]) {frontEndPlayers[socket.id].reloading = false};
     listen = true}, GUNRELOADRATE)
   
 }
diff --git a/public/js/frontend.js b/public/js/frontend.js
index 46403f9..50bb80d 100644
--- a/public/js/frontend.js
+++ b/public/js/frontend.js
@@ -690,6 +690,7 @@ document.querySelector('#usernameForm').addEventListener('submit', (event) => {
   // hide key info
   //document.querySelector(`div[data-id="keyinfos"]`).style.display = 'none'
   resetKeys()
+  
   socket.emit('initGame', {username: document.querySelector('#usernameInput').value, width: canvas.width, height: canvas.height})
 })