Single-player games like Castella
Below are 8 single-player Steam games similar to Castella, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Castella page.
Ranked picks
- 1
Skyward Bastion
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Strategy and Early Access with Castella.
Skyward Bastion is a roguelite tower defense game set on floating islands. Build and upgrade your defenses, unlock new strategic possibilities, and adapt your run to procedurally expanding maps.
- 2
RealmGuard
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Strategy and Casual with Castella.
Realmguard is a rogue-like tower defense where every run is a strategic balancing act of expansion and elemental strategy. Expand the map tile by tile, uncover random encounters and hidden rewards, upgrade weapons and combine elemental effects for powerful synergies to survive.
- 3
Deck Defense
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Strategy and Casual with Castella.
Tower defense meets deck building in Deck Defense. Defending against the blobs is no easy feat. Will you prioritise fortifying your tower defenses or expanding the map? Build your deck with over 75 cards to choose from.
- 4
Wandering Monolith: Rogue TD
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Strategy and Casual with Castella.
You are the Wandering Monolith, falling from the sky. Summon towers, expand the board, defend your core, and build your deck of upgrades to conquer countless worlds.
- 5
Court Wizard
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Strategy and Casual with Castella.
Cast spells, brew potions, and command defenders in this real-time strategy game. Choose from wildly different wizard archetypes, master spells with talent trees, and survive endless waves of attackers. Every wizard changes how you play. Can you defeat all of the bosses?
- 6
Rogue Kingdoms
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Action and Strategy with Castella.
Classic tower defense meets roguelike adventure where you control the hero! Dive into procedurally generated levels filled with unique waves of enemies. Create powerful synergies with a variety of game-changing skills, relics, weapons, and traits to defend your kingdom. Every run is a new challenge!
- 7
NO ENTRY: OUR BURROW
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Action and Strategy with Castella.
A roguelite incremental game where you fight by linking animals.
- 8
Desolation Arcanist
Single-player alternative to Castella — playable solo, no multiplayer required. Shares Action and Strategy with Castella.
Craft your own magic in this Action Roguelite. "Program" your wands with varied Spell Cores (Fireballs, Flying Swords... or Watermelons?) and Runes. Raise your companion Dragon, command a Puppet army, and abuse physics to knock enemies off cliffs. Your build is your destiny.