You can get the details on all the changes, tweaks, and additions Vampire Survivors has made with patch 0.5.1 in the patch notes below.
Vampire Survivors Patch 0.5.1 New Content Contains 6 new achievements to unlock: 1 new, hard Challenge Stage 1 new Character and 1 new Weapon 1 more rank for Reroll and Skip powerups 2 new Arcanas Tweaks: Added a toggle in Stage Selection to disable Arcanas.
These backups will not sync with Steam Cloud, so you can restore them manually if needed.
Halved projectile explosion damage from Arcana XIX – Heart Of Fire.