Until the end of the year you can download Die Young DRM free directly from Indiegala who are the publishers (and developers?) of this game.
It is the full game and has all the content as of the time of downloading.
The difference to the Steam version is that this DRM-free version will not get future updates (if there are any).
However, this is a great opportunity to try the full game (in your own time and at your own pace) and if you like it then you can later buy the Steam version which will be kept updated.
Here is the link for the game on Steam:
And a final note: If you play the DRM free version your saved games are compatible with the Steam version. So if you buy the game on Steam in the future you will not have to start over (from the website).