Now that the jam has ended:

New: 

Flavor texts!!! Dialogue between Winter and Autumn at the start of the fight and when you reach the solstice. Also monologue on death
Hard mode. (Must have reached a highscore of 3000 to unlock) VFX and SFX on projectile destruction
Discord implementation (shows you playing the game, your highscore and if you're playing with hard mode on) (The overlay might be pretty annoying, you may want to disable that in your discord settings) It actually broke the game so I removed it for now, I'll look into adding it back later cuz it is fun
Controls have 2 default settings options 
Kofi embed in the credits page. (Will be shared between me (programmer) and the artist if you ever donate, but obviously only do so if you can comfortably afford to! I don't expect many will donate but eh, might as well leave the option open) 

Adjustments: 

Slower scythe attack
Snowflake crash attack now scales with the difficulty 
Ice Pins now have patterns. Might go back on that and also have a chance of random patterns.
Small UI tweaks
Changed the map disintegration animation for one that originates from the boss. Might go back on that one.
Removed a bunch of unnecessary duplicate assets
Probably a few other things I forgot, but that's most of it

Bugfixes :

Boss should no longer freeze if you destroy an ice pin before it activates 
Moving while attacking should still attack faster, but the attack cooldown was reduced so it's probably not worth it :P 
"Hold to skip" message appears on every cutscene
Lowered the volume on some sfx