Does exactly what it says on the tin, but in agreement with my fellow commenters, it's just the tip of the iceberg (err, fireball?). For next steps, you might consider exploring NavMeshAgents to create AI that chases down and attacks the player, to give them something to defend themselves against.
Ooh, and for a little extra juice, perhaps have the houses activate an explosion particle effect when destroyed. An epic soundtrack calls for epic action, after all.
You're off to a good start. Keep up that momentum! :D