Changelog for Update 1 (added 17 July 2018):

Posted here.

Changelog for Update 2 (added 04 February 2019):

Hi there! We're releasing the second patch for Detective Gallo!

Remember that savegames are not compatible across versions, but if you were in the middle of playing the game at the time of the update, you can switch to the previous version through the betas tab.

What's new?

Spanish Localization You can play the game in Spanish from today!

"not compatible across versions" is quite a strong indicator how much (or more not so) you value the time of your customers and that most likely something is wrong in your game development decisions. Just sayin'.

I'm still at the start of the game, so I'm fine with it.
Besides, I don't know how long it takes to play it, but it most certainly not an RPG, where such an incompatibility would mean much more.

Changelog for Update 3 (added 26 April 2019):

Hey guys, today we're releasing the 1.21 patch of Detective Gallo!

Remember that savegames are not compatible across versions, but if you were in the middle of playing the game at the time of the update, you can switch to the previous version through the betas tab.

What's new?

Some Spanish translation updates

Just saw this, so forgive the late reply.

I'm afraid your remark is misdirected as I'm not affiliated with the devs in any capacity, just a regular GOG user posting changelogs as they become available.

I suggest you contact the devs directly.