Fantastic polish, from sound effects to aesthetic to consistency! The core game idea is also fantastic, utilizing your enemy's attacks against them; especially the last level where all the enemy types come together, giving you choice on what kind of enemy you want to soullink with. Love the line of sight idea too!
My feedback is managing my partner's health as well as mine was somehow overwhelming to me, and I often died without really knowing why. That's probably me just being bad at the game, but I think something about the design could be tweaked to make that better for players.