Resonance (tuxdb.com)

When a brilliant particle physicist dies unexpectedly, the race is on to secure his terrible new technology before it falls into the wrong hands. The lives of four playable characters become entangled as they fight against the clock to find the dead scientist’s secret vault.
The suspicions they harbor, the memories they guard, the connections they share - all will converge as these four ordinary people work together to prevent a potentially cataclysmic disaster.

Key Features:

Voiceover work featuring fan-favorite Logan Cunningham (Bastion)
Four simultaneously playable characters
A twisting, riveting storyline influenced by player decisions
Long and short term memory system - ask anybody about anything in the game!
Over ten hours of gameplay!

Resonance - MAC/LINUX BUILDS with WORKING ACHIEVEMENTS! and more!

- Updated all versions to newest stable AGS, so a lot of problems have been fixed.
- Added proper LINUX and MAC ports with WORKING ACHIEVEMENTS!
- If you want to revert to the older Resonance, opt into beta channel "original", password is "resoresoreso", your older saves won't work with this version.

Here's a small guide.
1) Right click on Resonance, go to PROPERTIES.
2) Properties
3) Betas
4) typing in that text input box "resoresoreso" WITHOUT QUOTES, hitting check code
5) Hitting the blue button that will appear
6) The game will begin downloading files and once that's done, your saves will still be there and ready to be loaded.

- Added Steam Cloud support [cross-platform even]
- Here are saves in case someone needs em!

http://primordia-game.com/Files0/Strangelando/Resosaves.zip

If you want, u can extract them into your saves and load the relevant names.
Your saves are located at:
1) Windows:

%USERPROFILE%/Saved Games/Technobabylon

2) LINUX:
~/.local/share/ags/Technobabylon

3) OSX/MAC
~/Library/Application Support/Technobabylon