Rustler has been updated to version 1.05 today by Jutsu Games. You can find out the complete patch notes from here.
While the patch notes mention that this is another update related to the bug fixes, the official Steam forums have elaborated on it a little confirming that this update has added a new feature called Tauning among other tweaks and bug fixes.
Rustler Update 1.05 Patch Notes
- Taunting is in da house! If you have a sword and a shield, you can taunt and provoke your enemies by hitting your own shield with your sword. [Tip: When Guy uses a sword with a shield, press RMB + Tab to taunt during the fight.]
- Tank’s image will change according to how damaged it is.
- You can see the damage done to the tank more clearly now thanks to the smoke and splinters coming from it after each hit. You can also hear a “boom” when it breaks down.