I have 2 problems.
(1) MY enemies (bugs) only move straight down in a straight line. They also pile up on thenselves. Once they stop moving, they wont attack me.
(2) When i kill one, i want a random experience to be given to the player. For now i made it 3, so i could code the rest easily. When i kill an enemy, it displayes the text, but my exp doesn't go up on my stats panel, and when i get 15(the level up experience level)by counting in my head, my level doesnt go up!!

I used Zial's tutorial but now im taking it farther just so u know. And also my map is only 1 screen if that matters.
Here is my code:


//This is a test world started by Tabu34 on 3/15/04 and yet to be completed...
mob
var/level=0
var/exp=0 // experience (total)
var/expNeeded= 15 // experience for the next level
var/maxHP= 20
var/expgained= 3
proc
DeathCheck() //checks to see if an attack is deadly
if (HP <= 0) //if the defender's HP is low enough...
world << "[src] dies!" //do the death messaging
world << "[src] was killed by Tabu34!"
world << "Tabu34 gains [expgained] experience!"
exp+= 3 //adds exp points
if(exp>=expNeeded)
LevelUp()
del(src) //delete whatever just died
PDeathCheck()
if (UHP <=0)
world << "Tabu34 dies!"
world << "Tabu34 was killed by [src]"
src.loc = locate(1,1,1)//restarts
src.UHP = src.maxUHP//resets health
InjuredCheck()
if (HP <=15)
icon = 'bugcut.dmi'
else
icon = 'bug.dmi'
LevelUp()
++level
src << "Welcome to level [level]."
maxUHP+=4
UHP=maxUHP
expNeeded*= 2
mob
icon = 'person.dmi' //makes it so all mobs will be created with the person icon
name = "player"
var
HP = 30 //declares a new variable called HP, with a value of 30
wealth = 0 //total money
UHP = 40 //new var Hp for user
maxHp = 30 //max hp for bug
maxUHP = 40 //max hp for user
strength = 3//change to the amount you want the player to have
defense = 2//same here
Del()
var/obj/gold/G = new(loc) //create a new obj from the gold blueprint
G.amount = rand(1,100) //set its amount variable randomly
..() //call the parent
Login()
icon_state = gender //when a player logs in, make their icon's state
..() //the gender of their key. Then call the parent!
world << "[usr] had logged into Testworld!"

bug
icon = 'bug.dmi'
name = "bug"
strength = 5
defense = 3

var/mob/character/
New()
. = ..()
spawn()
move()
proc/move()
while(src)
var/Found = FALSE
for(character in oview(5,src))
step_towards(src,'person.dmi')
Found = TRUE
break
if(Found != TRUE)
step_rand(src)
sleep(10)
sleep(5)

Bump(mob/M)
if(istype(M,/mob/))
attackb(M)
proc/attackb(mob/U)
var/damage = rand(1,strength)
UHP -= damage
U <<"You are being attacked by [src.name]!"
src.exp += rand(1,5)
src.LevelUp()
PDeathCheck()

verb
attack(mob/G as mob in oview(1)) //attack a mob within 1 tile of you
usr << "You attack [G]!" //send this message to the usr
oview() << "[usr] attacks [G]!" //send this message to everybody else
var/damage = rand(1,10) //assign a random # to a new variable
usr << "[damage] damage!" //tell the damage to the world
G.HP -= damage //take away the damage from M
G.InjuredCheck() //check for injuries w/ proc
G.DeathCheck() //check for death with a proc
say(msg as text) //What the usr says is passed into "msg" as text
world << "[usr]: [msg]" //The world sees chatroom-like output

obj
gold //define a "gold" prototype, which is a kind of obj
icon = 'gold.dmi' //set the default icon
var
amount //declare a new variable called "amount"
verb
get() //obj/gold/verb/get()
set src in view(1) //src must be close
usr << "You pick up [amount] gold."
usr.wealth += amount //add to usr.wealth
del(src) //delete the gold
obj
tree
icon = 'tree.dmi'
density = 1
turf
grass //defines a "grass" prototype, which is a kind of turf...
icon = 'grass.dmi' //and has an icon named 'grass.dmi'. In single quotes!
world //we set one of our world's characteristics:
turf = /turf/grass //its default turf is the grass turf.
mob/Stat() //Call the Stat proc that updates the stat window every Tenth of a second...
stat("[src]'s Stats:",src.desc) //Place in the stat panel, the word Stats:, and the srcs description.
stat(" HP: ","[UHP]/[maxUHP]" ) //It makes it easier to read if you put a bunch of spaces like that.
stat(" Gold: ","[wealth]")
stat(" Experience: ","[exp]/[expNeeded]")
stat(" Level: ","[level]")
//END OF CODE

Any and all help will be appriciated. Plz make it easy to understand!!