Welcome to the download page. It is here the real stuff are.
Version 2.1.2 (recommended):
Debian and Ubuntu users might choose to install the blockattack package instead:
sudo apt-get install blockattack
Itch users can also find the game on itch.io and install it with the Itch.io App.
The Puzzle Level Editor:
This includes documentation
The source is now hosted in a git repository at GitHub here.
The master branch contains the development version for 2.X.Y and is considerable different from 1.4.2.
1.4.2 can be found in its own branch.