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That turns out to be more interesting than it sounds, because the base game keeps most of its own maths hidden. In a normal level you never learn exactly how many peas it takes to bring down a particular zombie, or precisely how long a wallnut holds under a given amount of pressure — you only learn whether you survived. Here you can set up that exact question, run it, and watch the answer, which is knowledge that transfers directly back to every other version on the site.
It is also simply a good toy. Staging fights the campaign would never permit — one plant against an absurd column of zombies, or a lane configuration no level would ever hand you — produces the kind of outcome worth showing someone, which is the same appeal physics sandboxes have always had. Nothing is scored, nothing is lost, and nothing stops you rearranging the whole lawn halfway through.
The catch is the one every sandbox has: it supplies no momentum of its own. Arrive without a question and you will click around for five minutes and leave. Arrive wanting to know whether a particular defence actually holds, and it will keep you considerably longer — and make you better at the other versions in the process.