Update 2.1.2(19 November 2020)

Fixed several crash issues

Fixed an issue which could cause newly unlocked NPCs to show up much more frequently than intended

Fixed an issue which prevented Bello’s quest from progressing for save files started after the Hello to Arms update

Fixed an issue where some knockbacks could become permanent after being revived by the Clone (causing continuous movement on the player)

Fixed an issue where the Cop could get stuck in his firing animation

Fixed the tiny Casey sprite in the shop screen
Update 2.1.1(17 November 2020) Bug Fixes

Fixed an issue causing the Black Hole Gun’s projectiles to have no effect

Fixed an issue which could prevent the Untitled Gun from firing

Fixed an issue with the Bullet Bore that could interrupt some boss attacks or the locktopus intro

Fixed an exploit involving Bello's Shop and Bait purchasing

Fixed a bug that could cause errors in Portuguese and German translations, specifically for NPCs trapped in cells

Glocktopus: Fixed an issue where Clone was not behaving correctly when the player died in this fight

Glocktopus: Fixed an issue where the tentacle attack was ignoring player invulnerability (e.g. Lead Skin)

Helmet Kick: Player skins are now correctly shown

Helmet Kick: Music now obeys the Music volume setting
Update (13 November 2020)

Arsenal Mode: a new toggleable game mode in which weapons will be available as loot as well as for purchase in shops. Any number of these weapons can be held in addition to the Blessed gun, and can be used at any time. These additional carried guns have limited ammunition, which can be replenished by finding ammo pickups (exclusively in Arsenal Mode). This mode was designed to be more reminiscent of Enter the Gungeon’s gun management.

Shop Hubs: Bello’s shop has been expanded and now can be accessed twice per floor, allowing players more choice over when and how to spend their currency. This shop replaces the normal mid-floor room, in addition to its normal appearance after the boss. The shop has several doors to optional combat and NPC rooms that can be explored for loot or skipped. This should result in an overall increase in itemization for players who explore all rooms, as well as providing a source for weapon drops when playing in Arsenal Mode.
Other New Features

A new optional boss, the Glocktopus -A new NPC, the Ledge Goblin, and her minigame

As is tradition, several new guns, items and rooms

You can now pet the dog
Gameplay Changes / Improvements

Added three new achievements

Added the option to skip the Dragun's intro if you've already beaten the Dragun once

Increased the spawn rate of minigame rooms if the player is on a quest

Reduced NPC cell spawn requirements across the board (later NPCs no longer require buying items from previous NPCs)

Added an auto-aim controller option

Powerup UI icons will now flash shortly before expiring

Rebalanced many weapons to better work with the new Arsenal Mode

Enemies in rooms will now spawn more quickly if they’re being killed very rapidly

Made spamming the jump button less effective; dodges should requiring timing

Bullets and beams will no longer collide with the Dragun when he is too far away to take damage

Gave the player brief fall damage immunity when boss cards appear

Performance improvements for room transitions
Bug Fixes

Fixed several controller binding issues (better handling of multiple controllers, swapped controllers, and saving bindings as soon as the binding screen closes)

Fixed an issue where repositioned spawners would could move offscreen for some enemy types

Fixed a pathfinding issue which could cause some companions to become very attracted to the corners of the screen

Fixed an issue where Yari rockets wouldn't target Spectral Gun Nuts

Fixed an issue where spike traps could render over the player in some situations

Fixed the Polish translation for Riddle of Lead's description

Fixed a case where Lead Maiden projectiles could hurt the player while leaving a room

Fixed an issue where the dog couldn’t be pet in the scene after the final boss