FreeGameDev

From the game's readme:

Steampac is a maze game inspired by the popular Pac-man (also known in Spain as "Comecocos"), even with a different aesthetic (a mix of steampunk & toon style) and with characters and scenes made in 3D.

This game is fully developed with Blender and uses his game engine.
Except a couple of lines of code in python, all programming has been carried out by "logic bricks".
For more information, visit nosinmipixel.blogspot.com.

The game was created by Angel Sánchez and is under the GPLv2.
It can be downloaded on sourceforge, but there doesn't seem to be any source code repository available.

However, since it was made entirely in Blender and the provided tarballs include all the .blend files, the "source code" is there allright.

Article in Spanish about the game on the creator's blog: http://nosinmipixel.blogspot.com.es/201 ... rcade.html
It contains a video of the game in action and provides download links for Windows, .deb files and tarballs at the bottom.

Someone in the comments section also already made an AUR package available here: https://aur.archlinux.org/packages.php?ID=63199

Hum…
I installed the aur package.
The main menu is laggy on my computer, while I got a rather powerful one.
Also, there are a lot of "timing bugs" in the game, for instance I once took a "magic pill" at the same time a ghost hit me, and I lost a life while ghost actually did got vulnerable and the "magic pill" was taken. I also got an other one weird like this, I don't remember exactly what.
I also was disappointed once I finished level 1 to see the same stage, I was expecting a different map.
Last thing, I would have prefer the pacman to always move, the arrows would only be used when changing direction. But maybe it's just a personal preference.

So, a pretty nice game, but a little buggy and a little heavy.