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Simple Leveling up system

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Miguelink 64:
Hello, while I was doing my homework I got an idea from a simple algorithm I solved in my head (I get really bored making homework), I coded it, put it to test and everything works fine. Since I won't use it for my game, I'll share it here in case someone else who is new on programming (like me) or just too lazy wants to add a leveling system to their game, here it is:

--- Code: ----- Leveling up System by Miguelink 64.

-- First make a leveling up item on your items folder, I used a +2 to max hp for every level up.
-- heart_container
local item = ...
local game = item:get_game()

function item:on_obtaining()

-- Add to your dialogs a _treasure dialog for the item, mine says "Level up!".

-- You must copy this script to your enemies you want to give you exp.
local exp = 1 -- Change this to the wanted experience given by killing the enemy.

function enemy:on_dead()
  if game:get_value("level") ~= game:get_value("max_level") then
    game:set_value("experience",game:get_value("experience") + exp)
    if game:get_value("experience") >= game:get_value("max_experience") then -- Checks if you can level up
      hero:start_treasure("heart_container") -- You can change this for your leveling up item.
      game:set_value("max_experience",game:get_value("max_experience") * 2) -- Doubles the amount needed to level up next time.
      game:set_value("experience",0) -- Resets experience
      game:set_value("level",game:get_value("level") + 1) -- Level up

-- You must copy this script to your initial game script under
-- function initial_game:initialize_new_game(game)
  game:set_value("max_experience",50) -- Max experience needed to level up from level 1 to level 2
  game:set_value("experience",0) -- Creates experience
  game:set_value("max_level",20) -- Max level achievable
  game:set_value("level",1) -- Start at level 1

--- End code ---

Welp, have fün.

It reminds me of a script I made, but yours is at least up to date.
There have been a lot of script sharing recently. Thank you to you and the Solarus community. It's cool.

I recommend to use a linear growth instead of an exponential one. You would need only 26214400 xp to level up from Lv19 to Lv20, heheh.

Miguelink 64:
I didn't knew the exact amount needed to get that level, linear growing could be a good solution, but exponential is one most RPGs uses, since Lua only accepts intergers, that's the lowest I could get without getting too arithmetic to make a proper exponential growth,  thanks

Since when did lua only accept integers?
I've done quite a bit of programming in lua where I've used non-integer numbers and the functions math.ceil() and math.floor() exist, which round a number up or down respectively.


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