Yeah I was originally planning 3 acts with 3 bosses but didn't have time for it, so I did one act with no boss. I think the lack of diversity in play styles and easy difficulty in the game stems from a lack of different cards (other than cells there's only Enzyme, Peptide, and Lifecycle). With more types of cards you'd be less likely to draw the ones you actually need; in the current game it's easy to draw 3-5 Enzyme or Peptide cards when you need extra attack or shield. I might release an update after the jam is over that adds about 15 new cards, could also buff some of the enemies.