Alien Swarm vs Alienation

Alien Swarm drops you and up to three friends into a hostile off‑world colony, forcing you to coordinate tactics and choose from four distinct marine classes. The free‑to‑play title blends intense shooter action with squad‑level strategy as you clear icy surfaces and lava‑filled mines of relentless alien threats. Beyond the core campaign, the game includes the full Source SDK code, offering developers access to a 3rd‑person camera, depth of field, dynamic shadows, and numerous gameplay enhancements for modding and custom content creation.

Alienation is an isometric action shooter set in a sci‑fi fantasy world where you play as a mercenary fighting relentless alien invasions. The game blends frantic gunplay with loot‑driven progression and supports up to four players in cooperative mode. The title offers a single‑player campaign and a co‑op mode that lets friends team up to clear waves of enemies, upgrade gear, and tackle challenging boss encounters on PlayStation 4.

• Free to download and play
• Deep tactical squad mechanics
• Extensive modding support with full source code
• Varied environments and alien types

• Intense, fast‑paced combat
• Deep loot and upgrade system
• Supports up to four‑player co‑op
• Clear visual design with isometric view

• Limited graphics compared to modern shooters
• Multiplayer may feel empty without a community
• Steep learning curve for class coordination

• Limited to PlayStation 4 platform
• No dedicated competitive multiplayer mode
• Replay variety can feel repetitive after many sessions