But to solve your issue, it goes as follows:
Have EXP to level up, You can check your progress on the bar on the right.
Sleep, normaly in your ship, to Level up. If you do level up, you get a Daft Punk-reference.
If you are level 10, you gain a message that you can not level up anymore.
Now, down left, close to the save/load button, there is a button that was not clickable before. Click it.
Spend points in stats and chose the new trait you gain. That was all.
If you do have:
- Under level 10.
- Full EXP.
- Did sleep (on the ship).
- AND still have not the level-up avaible in th down left corner.
You got a bug, move to the bugreport-area.
If this two things are both not helping, I did run out on ideas.