Just cleared the Heart on my first run. Ran a self-retain/upgrade deck with the enhanced version of the starting relic. It seemed very powerful especially when the retain damage/block boosting relic came into play.

Anyway, I found 1 bug, 1 issue, and 1 disappointment.

-The bug was where I quit the game mid-battle without closing it, and came back later to have 2 of the self-retain cards I had retain themself into my second hand. I believe what happened was, I quit the game when my turn was ending with those self-retain cards and it saved that in the system.

-The issue was in the fight with the two tentacle elites before the heart, the Shield Tentacle made me lose 1 focus with his debuff attack, which is normally reserved for the Defect. Obviously in that case, it didn't effect me at all. If you can modify that, maybe make it -1 Dexterity..?

-Finally, the disappointment... The third boss I ended up facing off with was The Time Eater... I really expected a unique dialogue or something... But nope... He didn't even react out of the ordinary. Maybe change that if you can?

Otherwise, it's a great character and I look forward to the future additions you bring into the game.