EnforcerSunWoo: Anybody have any idea on this?
https://www.gog.com/forum/hotline_miami_series/hotline_miami_double_barrel_shotgun_sound_bug Contacted more delinquent devs/publishers, will see if anything is accomplished or not.
Unfortunately, a version parity between Steam and GOG is by no means a guarantee that all fixes made on Steam are the same as those made on GOG, even when we are provided with a changelog. After all, everything is handled by humans who can make mistakes, and the number of a version of a game is decided arbitrarily, no one can guarantee us that every single file is identical between all stores.
For example, the GOG version of
Control has a bug that causes the game to crash during a boss fight that isn't present in other store versions.
Darksiders Genesis has a bug that has been fixed in the Steam version that prevented you from hearing the soundtrack during the end credits. Although the version is identical to the Steam version, the bug is still present on GOG.
In the GOG version of
Ruiner, the Arena leaderboard never worked properly.
In all of these cases, the publishers have never done anything despite multiple reports of these bugs.
These are very specific cases that can only be uncovered by fans of the games who can make comparisons between versions, so I wouldn't be surprised if Hotline Miami is also a similar case.