Hello,
I'm sorry for a confusion!
Assuming you've checked out ignition.git repository, /ignition folder is a Godot game project folder with assets, scenes, gd-scripts. But in order to open it successfully, it is necessary to have a matching Godot binary. You may use a prebuilt Godot binaries.
For "v0.1.0"
> git checkout v0.1.0 -f
> use https://github.com/z80/ignition/releases/download/v0.1.0/godot_and_ignition-v0.1... Godot binary.
> in Godot window click "import" and browse to /ignition/project.godot.
For "dev" branch
git checkout dev -f
> use https://github.com/z80/ignition/releases/download/godot_4.1.2_stable_960ccf8fe9/.... Godot binary.
> in Godot window click "import" and browse to /ignition/project.godot.
Alternatively, you need to build a matching Godot binary from sources. As an example, these steps may cause success:
open "x64 Native Tools Command Prompt for Visual Studio" (a terminal window)
> cd <folder where you want the project to reside>
> git clone git@github.com:z80/ignition.git ./
> cd ./godot
> git checkout v0.1.0 -f
> scons target=release_debug tools=yes -j8
> cd ./bin
> ./godot.windows.opt.tools.64.exe
in Godot window click "import"
browse to /ignition/project.godot file
click "open"
Please let me know if you encounter any issues.