The goal of the game is to have fun. Solving all of the puzzles, collecting all of the collectibles, or just caring for your villagers are all parts of the game. Some like seeing how many different events or gong events they can get, others may start new games as soon as the puzzles are all solved.
If you start a new game there are also many options, different speeds, different difficulties. With the tutorial or without it (in some ways with the tutorial can be more challenging since it takes the eldest female out of the workforce and adds another mouth to feed...) The first two events that occur, and/or whether you have a villager who like (or dislikes) running can make a big different in the gameplay.
But there are also different decisions on game pacing that can be made. Try to solve as fast as possible, or delay in hopes of getting more collectibles? Change the order that you get the tech upgrades? Can you avoid L2 Farming until you have enough points to jump straight to L3 Farming? Does the pacing change if you get the Science upgrades early or get them late?
I started a new game the other day, and I'll admit that I got lucky with starting with a runner (even if she's the oldest female) and two very good early events. So I may give myself another challenge. Can I solve all of the puzzles without building any huts? i.e. keep the village population to 10?
The choices that can be made are unlimited, please don't limit yourself to playing one game and thinking "that's all there is."
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Isola is a magic island! All sorts of strange things can happen, and often do happen. -- arnie