This guide will let you know how to Level Up from level 10 to 20 fast in Icarus.
The first thing you will need to do is craft an Oxygen Bladder. You can get it from tech tree tier 2; it is made of 30 leathers, 8 bones, and 20 fiber, as shown in the image below.
You also have to upgrade your talents to get more skin, leather, and skinny fur and yield bones. You will need to make it repeatedly because it will give you 340 experiences. After that, click on it, craft it, and then you need to destroy it.
You will need to do this process as much as you can, craft it first, then destroy it and then again craft it and destroy it. You will get a lot of experience that will help you level up fast, as shown in the image below.
For more experience, you need to do the hunting, and you can also get the leather bones and fiber through which you can craft this bladder.