Solar Smash

Solar Smash has no objective beyond the destruction itself, there's no score, no mission structure, just a planet and an escalating arsenal of lasers, asteroids, and black holes to test against it, which makes it closer to a physics toy than a traditional game.

Because different weapons interact with a planet's surface and atmosphere differently, a laser that just scars the crust and a black hole that consumes the whole planet aren't interchangeable escalations, worth experimenting with each to see how it actually behaves rather than assuming bigger always means more visually interesting. People Playground offers a similar consequence-free physics-destruction sandbox at a much smaller, more personal scale.