First of all: Yes buy this game!

At first I didn't want to buy this game and a friend bought it for me, so I had to play it with him.
I wasn't sure the game would look too nice and it looked outdated. Also it was another game, which used its users to pay for an alpha :-/
So I installed the game and gave it a try and to tell you the truth "I was so wrong!".
This game has it all.

Graphic:
It looks so much better ingame and has many details you will find during your playthrough. If you look at the sky at night/day, wet surfaces look shiny and so on.

Gameplay:
-I wont cover everything, because you can do too much in this game and even my time is limited :P
You can build massive and beautiful buildings. The buildings have Physic, so build accordingly, smoke needs a way out of your building, or it kills you / won't turn on.
-Fighting reminds me of a "souls like" fighting. you can attack with many weapons, block attacks, roll, run, jump, but it all need stamina and if you don't have it --> you are dead!
Using weapons/tools/"skills" will level yourself up on that object/"skill".
-you will need certain tools to gather other/new materials and getting new tool will require to kill a new boss, enemy, or clear a dungeon.
-you will come to a point in the game, when you think you are pretty strong and you gear should be pretty good, well let me tell you the game has a way to show to you, how wrong you are (souls like).

Coop
-coop makes any game better and in this game it shows even more the coop fun
-10 player coop, if you want with pvp, so perhaps a 5v5 coop/pvp tribe action?!

Summary:
Well I could write for hours on my review, but my verdict will be same: Valheim is a great game, for a small price. Buy the game and gift it to others, so everybody of your friends can enjoy the game together!
If you are not 100% convinced there is a way to test the game, so it can convince you with no risk involved. Buy the game and if it cannot convince you, just
hand back the game after an hour with the Steam policy.