tl;dr

Turbo Mode, more cards, more rerolls, more classes, more enemies, more waves, more options, better UI.

Projectile trails will return in a future update (they are getting a performance fix.)

If you don't like mousing over pickups, try the Auto Pickup Gameplay option. 

If you lose your cursor, try the Cursor Lines Gameplay Option.

v1.2.1

Prevents Treasure from being clicked while selecting rewards

Cursor Lines now process while paused

Changes Unit Bullets textures

Renames tower_defense.save to game_data.save (handled automatically)

Renames tower-defense.exe to cardtd.exe

Adds additional spawns to some lacking enemy waves

Adds Auto Pickup option

Adds Cursor Lines option

Adds lives and win state to stage results

Adds Monk, Vitrikinetic Classes

Adds names to most Relics

Adds Stage previews

Adds turbo mode

Adds two new Enemy types

Adds unit deselection when left clicking empty space

Adds waves up to wave 30

Card weighting has been updated (rerolls further reduce the chances of finding the card again, rerolling frozen cards now keeps their weighting)

Changes Fly behaviour

Destroying Relics now grants +2 Rerolls

Enemies now deal different amount of damage to life upon escaping

Fixes Corrosion's Wither and Burn stack application scope (Bullet -> Self)

Fixes EMP's card colour

Fixes enemy blood spilling in the top left corner

Fixes Paralysis stacks being removed every frame instead of on paralyze

Fixes Warp stacks not being removed on teleport

Frozen cards no longer unfreeze automatically

Changes experience curve

New Cards: Acid Rain, Nuclear Fallout, Dagger Fall, Blade Shower, Sword Rain, Blazing Skies, Lightning Strike, Lightning Storm, Thunder Crash, World Tree

New Relics: Essence of Star, Strange Box

Rebalances Railgunner, Scout, Assassin Classes

Rebalances Rain, Downpour, Deluge, Contemplate, Focus, Meditate, Accretion Disk, Meteor, Stun, Paralyze, Electrocute and probably more cards

Rebalances most enemies

Removes Comet Card (getting a rework?)

Removes timescale from difficulty (replaced with turbo mode)

Renames Lightning Storm -> Electric Field

Temporarily Removes Projectile Trails

Updates rain VFX

Updates the options panel

Updates Traffic Stage

Updates unit buttons in Main Menu Units tab