VOADI is not yet released.
When it is, there will be nice, easy downloads for each platform.
Until then, you can test the development version of the game by following the steps below.
These instructions work for Debian, Ubuntu, Mint, elementary OS, and possibly other Debian-based distros.
$ sudo echo "deb http://download.opensuse.org/repositories/home:/nate-devv:/solarus-debian/xUbuntu_16.04/ ./" > /etc/apt/sources.list.d/solarus.list
(Note: if you get an error, ensure the directory exists, sudo mkdir -p /etc/apt/sources.list.d)
sudo mkdir -p /etc/apt/sources.list.d
$ wget -qO - http://download.opensuse.org/repositories/home:/nate-devv:/solarus-debian/xUbuntu_16.04/Release.key | sudo apt-key add -
$ sudo apt update
$ sudo apt install -y solarus
Clone the game:
$ git clone https://gitlab.com/voadi/voadi.git
And run it!
$ solarus-run voadi
You're all set up.
In the future, you can simply launch solarus.exe and click the "Play" button without repeating any of the other steps.
When a never version of VOADI is released, you can upgrade to it by deleting your old voadi folder and putting the new version in its place.
Other systems, including MacOS, Arch Linux, Gentoo, OpenBSD/FreeBSD, and OpenSUSE are also supported.
See the Solarus download page for more information: http://www.solarus-games.org/engine/download/