Mewgenics vs Slay the Spire 2
Punishing cat-genetic strategy versus streamlined deckbuilding — both roguelites reward mastery, but one demands a lifetime.
Makes good on the decade-long Mewgenics dev cycle — McMillen and Glaiel's cat-genetics roguelite hits Isaac territory at 89 MC and 94% recommend.
Still the best deckbuilder roguelite — Mega Crit's sequel deepens the relics and events without breaking the original's perfect 30-min run-shape, on co-op now too.
Steam popularity
Shared scale — sparklines are directly comparable across both games.
Mewgenics
May 2026 peak CCU 13,554 ↓ 46% MoM
All-time peak 115,063
Slay the Spire 2
May 2026 peak CCU 230,185 ↓ 36% MoM
All-time peak 574,638
Key differences
Core mechanics
Mewgenics uses turn-based tactical combat with cat genetics allowing cross-generational skill inheritance.
Slay the Spire 2 is a deckbuilder where you craft a deck each run, relying on card combos and relics.
Meta-progression style
Mewgenics has deep genetic manipulation across runs, letting you breed cats with specific traits for future playthroughs.
Slay the Spire 2 keeps progression within runs via relics and card unlocks, with minimal carryover between runs.
Run length and commitment
Mewgenics runs can last hours with a massive meta-game that demands 200+ hours for full completion.
Slay the Spire 2 maintains the original's 30-minute run structure, perfect for quick sessions.
Which one is for you?
Pick Mewgenics if
- You loved Binding of Isaac's runs and want a turn-based pivot.
- You are a Slay-the-Spire/Inscryption fan curious about cat-genetics meta-progression.
- You can pace 200+ hour run cycles without burnout.
Pick Slay the Spire 2 if
- You sunk 200+ hours into Slay the Spire 1 and want fresh relic combos.
- You are new to deckbuilders and want a 30-min-per-run entry point.
- You want a co-op deckbuilder that doesn't break asynchronous solo runs.
Bottom line
Pick Mewgenics for its deep genetic meta-game and turn-based tactics; pick Slay the Spire 2 for its refined deckbuilding, quick runs, and co-op.