This is fantastic! The gothic pixel art and title scene are gorgeous, and the idea that your attack stays the same while what happens when an enemy dies gets stronger is a perfect fit for chain reaction. The escalating banners from CASCADE to ANNIHILATION and the score exploding as the chains grow felt great, and the mutation choices add real build variety. One suggestion: the early game felt very automatic and the effects get so dense that it is hard to see the player and threats, and the mutation card text is long, so a shorter summary and a visible list of owned mutations would help. Amazing work!