Hollow Knight has updated to version 18.104.22.168 on Galaxy with no changelog, but i'm guessing it may be the bug fixes/tweaks that were in beta testing on the Steam version.
Edit: It is indeed... Changelog from the Steam forums:
"Hollow Knight v22.214.171.124 available for all players!
Hollow Knight v126.96.36.199 is now available for all players. This includes numerous bug fixes and gameplay tweaks.
As always, if you have any issues let us know in the comments below!
'Voidheart' menu style now available
Fixed an issue where game could become slower over a game session for some players
Fixed issue where Enraged Guardian gates don't open if Crystal Guardian was defeated in Godhome
Little weaver corpse: Audio now obeys volume controls
Godseeker dialogue after radiance statue no longer plays in Godseeker mode
HP reduced for Ascended/Radiant Collector's spawned enemies
Leg Eater Discount now working correctly
Nail arts now affected by bindings in Godhome
Fixed issue where Dung Defender's balls got stuck in corner
Fixed an issue where Hornet Sentinel could get stuck in wall during Godhome battle
Fixed issue where defeating Failed Champion or Lost Kin in Godhome also counted as defeating them in Hallownest, missing achievement (if achievement was missed previously it should now be awarded when player next rests at a bench)
Added extra check to keep Pantheon of the Master bosses out of the ground
Fixed issue with GM's final boss where attack would telegraph in wrong position
Improved visibility of one of that boss's attacks
Fixed issue where completing Trial of the Fool did not unlock God Tamer's statue in Hall of Gods
Fixed file select screen display issue
Godmaster boss 'PV' gets stunned more frequently
Lifeblood Cocoons in Godhome produce more Lifeseeds
Trial of the Fool is no longer a requirement for accessing Pantheon of the Sage
Reduced HP of Godmaster's final battle
Reduced Markoth's HP in Godmaster battles
Several changes to Uumuu's Godmaster incarnation
Fixed issue where Hornet Sentinel could get stuck in corner of her Godhome arena
Fixed issue in final battle of Godmaster where a respawn could place player in the wrong location, ruining the battle
Fixed issue where nail arts could lose their ability to damage enemies
Fixed issue where a mechanism could be struck while it was retracted into the ground in Godhome
Fixed issue where players could use Dreamgate to warp out of ending sequence and bust the game
Fixed timer display issues for main game and Godmaster pantheons
Fixed Moss Charger's rustling grass not appearing
In Mantis Village, disallowed enemies from approaching the Mantis Claw item to prevent possible softlock
Game text fixes"