The screen will vibrate after you and the monster attack. The higher the damage, the greater the vibration. You can turn this off in settings.

Event adjustment:

Second Floor: scientist: 300 gold. Choose 1 card and get 5 copies. -> 200 gold. Choose 1 card and get 3 copies.

Card adjustment:

Paranoia: All enemies have +50% HP. -> All enemies have +25% HP.
Spike Armor +: Whenever you take damage: Reflect 6 damage back to the attacker. -> Whenever you take damage: Reflect 4 damage back to the attacker.