Changelog for Patch Patch 1.04/ GOG-3 (Windows/Linux/Mac) (added 4 July 2016):

- Nacho's beeps properly sound when he talks.
- Save files now show a leading zero when needed (Only shown in newly saved data, old saves will not show it).
- Game can now be closed with Alt+F4.
- Game now remembers if it should launch in full screen or not.
- Skip button deactivates while pressing Shift first (So puush users can send screens).
- Mixing keyboard shortcuts are now stable and complete.
- Advancing text through a gamepad is no longer possible to avoid gamepad-related bugs (Proper gamepad support will be added in a future update).
- Added message to the post-credits save screen to clarify that you can save New Game Plus data (dubbed HEART Data) there.
- New Game Plus intro talk no longer triggers if you complete the game and press New Game (You need to load the HEART data to see it, as intended).
- The flag for completing the shooter minigame now remains after New Game Plus.
- PC-9X no longer appears over everything if you fail to pay the light bill.
- Boss' bullets no longer remain on screen during the shmup minigame's victory sequence.
- Fixed assorted typos across the game
- An issue where full screen was disabled on OSX.
- An issue where saving during the break and loading would give less money at the end of the day (This change is only reflected on new saves made after the patch)

Does the GOG version have GOGchievements?

Happy holidays!

I don't know as I don't own the game, I only posted the changelog in the game forum. Perhaps ask a blue-text, or Support?

Changelog for patch 1.2.1.0 (added 14 February 2017):

- Prologue Chapter and Special Demo Chapter can now be accessed through the title screen.
- New wall designs can be bought through the Nanocamo app.
- An error where the game would crash exiting the Nanocamo app has been fixed.
- An error where you could buy one of the wall designs for less than the labeled price has been fixed.
- Assorted typos across the game were fixed

Changelog for patch 1.2.1.0 Hotfix / GOG-5 (Windows) / GOG-6 (Mac) / GOG-5 (Linux) (added 14 February 2017):

- Fixed a small, non-game breaking bug that affects special content that unlocks after completing the bonus content.

Patch 1.2.1.2 / GOG-6 (Windows) / GOG-7 (Mac) / GOG-6 (Linux) (added 20 February 2017):

- Bug fixes
- 4 bonus music tracks now available in the Jukebox

Changelog for Patch 1.2.1.3 / (Windows, Linux and Mac) (added 25 April 2017):

- a small update to fix some bugs in the game.

Ignore this post; misread something. Carry on!

Changelog for Patch 1.2.2.0 (added 16 November 2017):

- Japanese localization now available! Please select your language option of choice when booting up the game.

Changelog for Patch 1.2.3.0 (added 09 February 2018):

- Added cloud saves
- Added overlay support
- Added support for Simplified Chinese