Terraria is a wonderfull and addictive game
There is no wrong or right way to play Terraria, theres just your way. Playing Terraria will make you feel like a child again, using your imagination to set goals to complete.
The 2D 8-bit/16-bit art style and graphics in Terraria are very beautifull and pleasent to look at. Theres a fair amount of diffrent land scapes, jungles,hell,deserts,weird purple areas filled with giants monsters wanting to murder you and so on. The music in Terraria is also pretty good, alot of the songs are very catchy and easy to remember, my favorite one being when you vissit an area that has been infected by some weird purple substance called "The Infection".
Writing a a complete Review that would cover every part of Terraria would probably take forever and i'm pretty sure the majority of the people reading user reviews don't wanna read 5-10 pages just to find out if a game is good or not. Theres just to much content in Terraria and to many ways to play it . I gave a few example on what you can do, you can explore, fight monsters,bosses and explore dungeons trying to find gold and better gear for your character, dig tunells underground trying to find better material so you can build better weapons for yourself, you can build large structures using the material you gathered and... so many,many other things. I strongly,STRONGLY reccomend you get this game, it will suck so many hours of your life away you won't even notice it, theres just no reason for you not to buy it, the game's price is only 10 euros and during large sales on steam the price sometimes drops to under 5 euros. Go, go buy it now!