How would I make a "You won!" GUI come up if you had gotten the most kills in an amount of time?

So I am making a simple starter fighting game where you can buy new weapons and level up, that isn't the problem. I just can't seem to think up a script that would connect to my leaderstats within my game that actually works???

The script for my leaderstats is below:

1. game.Players.PlayerAdded:Connect(function(player)
2. local leaderstats = Instance.new("Folder", player)
3. leaderstats.Name = "leaderstats"
5. local kills = Instance.new("NumberValue", leaderstats)
6. kills.Name = "Kills"
7. kills.Value = 0
9. local deaths = Instance.new("NumberValue", leaderstats)
10. deaths.Name = "Deaths"
11. deaths.Value = 0
13. player.CharacterAdded:Connect(function(character)
14. local humanoid = character:FindFirstChild("Humanoid")
16. humanoid.Died:Connect(function(died)
17. deaths.Value = deaths.Value + 1
18. local tag = humanoid:FindFirstChild("creator")
19. local killer = tag.Value
20. if tag and killer then
21. killer.leaderstats:FindFirstChild("Kills").Value = killer.leaderstats:FindFirstChild("Kills").Value + 1
22. end
23. end)
24. end)
25. end)

Anyway, thanks for reading this.