Truly fantastic game design. The cards feel really balanced, and tight combinations of their perks lead to multiple satisfying strategies. Almost every card that I didn't like the look of at first had some value when built in certain decks. Pacing felt good, and overall length was ideal for an online game.
Red cards felt a little underwhelming, but still gave dividends when developed properly. I personally would have liked the broodmother to drop multiple spiders when upgraded rather than the 1, or the upgrades to give a touch more value.
Overall one of the best games I've played online in a while (and I made an account just to say so!)