Color me impressed, the whole game caught me off guard! I was hesitant to try this cuz I'm not big into deck-building games, but the bullet hell aspect sold me. Heck, the demo's a good blend of Undertale meets Slay the Spire in a way, only toned down with the card aspect, and I'm ok with that. I know it'll get crazier, but eh, I like how it is now. Visuals are great, has a distinct "Newgrounds" feel to it, in a polished, smooth, laidback, and personal way. Plus, the music is nice. Only a couple tracks, but they're enjoyable (and the battle theme takes the cake of course).
I'm delightfully surprised with this demo. Best of wishes!