Firstly - MouseCraft is currently -33% off and it probably won't be in a similar discount for a longer time, so it's a pretty good time to get it if you still haven't played it.
Secondly - since the launch we have been fixing and adding some stuff, but we didn't feel like they're worth mentioning separately. We thought we will write a bigger post when there's more to tell and I guess now is a good time to do it.
Changelog since launch:
Updated Steam integration to Steamworks 1.31 and fixed all Linux issues regarding Achievements, Leaderboards and Stats. It will also allow us to add Steam Workshop support in the future.
Increased the performance and quality of videos for Mac OSX.
Added full keyboard support - now you can play the game solely with a keyboard.
Added Xbox gamepad support for Windows and Mac OSX (support for Linux is pretty experimental). Details below.
Added 2 new languages: Italian and Dutch (thanks to Puxxup and jpelgrom)
Added Polish descriptions and names for Achievements (thanks to RobeN)
Added a "language sniffing" mechanism - the game will now set the language according to the operating system language (if there is no other language setting saved already).
Optimized a lot of graphics stuff - reduced the number of draw calls by 30%.
Added functionality to Effects toggle - setting effects to "off" will result in launching the game in a mode suitable for older, low-end computers.
Added a green outline showing the currently active Moving Brick.
Moved all brick outlines to a higher layer so they are more visible during Active Pause.
Feature cutscenes will no longer appear if you have already completed the level where the feature was introduced.
Lots of Level Editor bugfixes.
Windows: Xbox 360 and Xbox One controllers should work out of the box if you have the necessary drivers. A PS3 controller can be used with Motionin Joy application and emulating Xbox 360 controller.
Mac OSX: requires free 3rd party driver by Tattiebogle.
Linux: We're not really sure it will work - it really depends on the drivers.
Oh, and here's a little image showing the controls scheme for Xbox controller: