Minecraft is amazing. For you people out there searching and see this game and wondering "What is this?" I will tell you. Minecraft is a game where everything is made of blocks. Sound boring? It is 100% NOT! Minecraft not only is a creative game for the creative minds but it offers a big open world for the players to explore. You can gain survival skills by playing the game. Sounds easy so far. You build and explore..Well it isn't all that. You will need to protect yourself from the monsters of the dark. In caves, you will need to gather resources and fight zombies, skeletons and more awful creatures that you will find. Minecraft gets easier and easier once you gather lots of resources. You will need plenty iron and diamonds. Diamonds are really hard to find. When you are not building or exploring, you will need to hunt the pigs and cows and chickens. If you don't have food, you can die of starvation. Remember that you will respawn back either at a bed or at the spawn point. Doesn't it sound fun? IT IS!! There really is no end but you can beat the Ender Dragon. That is considered the end of the game but you can still play after the end. So basically, everyday you are fighting, exploring, and hunting for survival. This game is really fun and you should really try it out. Please rate my review a 5 if it inspired you to play this game. Well now you have an idea of what the game is about. It is really fun. Make sure you check it out

This was a nice description, but it needs to be a bit lengthier.
You described things well, just break it into sections and make it a little more detailed and longer.
Definitely good for your first time though.