Terraria was the first game i got on steam and I still play it after all these years. One of the best sandbox games ever made.

Some of the best action combat and build customization I've ever played. Tons of monster variety and 14 different weapon types with entirely unique move-sets with each monster having thier own armor set and weapon for most weapon types. Loads of cosmetic stuff for people who want fashion in their game. The world is beautiful and full of detail and character, plus all the monsters interact with the world and each other. With iceborn this game also has a CRAZY amount of content. (Dont use the "Defender" armor or at least not until you have really learned the game. It's powerful and can lead to VERY bad habits because of how forgiving taking hits is with it on.) Trading hits with monsters is rarely ever a good thing. The stun mechanic exists to punish getting repeatedly hit without evading.