Use the board as your goal
The experience description says players can climb a survivor leaderboard. Use it as a long-term challenge; its scoring rules are not stated in the public description.
Practical check
A leaderboard position is only comparable if the scoring and season rules are known. The official description does not specify whether rankings reset.
Source
Roblox — Survive a Million Monkeys
Independent fan-made guide. Not affiliated with Roblox or the game creator. Game details and codes can change; verify current information on the official experience page.