--> Right click the game in the library tab
--> Click Properties
--> Click the BETAS tab
--> From the Drop down box select "beta_v3.12"
--> Click close
The beta should then automatically download. Make sure that if the BETA doesn't work for you, you use the same method to turn it off.
The BETA version includes some upcoming fixes, changes and additions such as;
--> Added steam cloud support to save progress of unlocked ships, scores and coins (finally, I know).
--> Various small bug fixes, improvements and Linux input freeze fix
It's important you run the game once on the computer with your main save file, as it is going to back that up to the Steam Cloud first!
Adam Nickerson
Nickervision Studios
Also make sure to check out my upcoming game Diamo XL if you like this type of small arcade score chaser :)
http://store.steampowered.com/app/715010/