Robinette Builds/Robinnet at 530,000 kills
The most important thing is to find a credit card (Green) at the very beginning, as it will boost your luck. WARNING: Do not open any chests until you find at least one credit card (Green). Thanks to Golden Tomes, you will receive a large amount of gold, which you must spend on opening chests to maximize your luck.
Starting at level 2, you should ideally open all chests on the map, activate all additional boss summon statues, and survive for 12 minutes after the main timer expires. By this time, you will have 100,000-120,000 kills and around 700 levels.
At level 3, you do the same thing, opening chests and so on, and also survive for 16-17 minutes after the main timer expires. ATTENTION: It's very important to save your gold, as it's your primary damage source.
Next, in the boss room, you destroy the boss in an instant, stand in the center of the room, and enjoy 18 minutes of farming mobs. After 18 minutes, kills will come very slowly, and this will likely be your end.
This build is tested and recommended for conquering the leaderboard!