Games like Starfallen: Strength
Games like Starfallen: Strength include Slay the Spire, Timberborn, Manor Lords, Sir, We Have an Orc Problem, and Probably Stolen - Cyberpunk Shopkeeper Sim. We matched them by genre: closest matches first, and among equally close ones the better-known games.

Slay the Spire
Shared: Single-player · Steam Achievements · Custom Volume Controls

Timberborn
Shared: Single-player · Steam Achievements · Custom Volume Controls

Manor Lords
Shared: Single-player · Steam Achievements · Custom Volume Controls

Sir, We Have an Orc Problem
Shared: Single-player · Steam Achievements · Custom Volume Controls

Probably Stolen - Cyberpunk Shopkeeper Sim
Shared: Single-player · Steam Achievements · Custom Volume Controls

Paralives
Shared: Single-player · Custom Volume Controls · Mouse Only Option

Slay the Spire 2
Shared: Single-player · Custom Volume Controls · Mouse Only Option

Balatro
Shared: Single-player · Steam Achievements · Custom Volume Controls

Assemble with Care
Shared: Single-player · Steam Achievements · Indie

NieR:Automata™
Shared: Single-player · Steam Achievements · Custom Volume Controls

Just Cause 2
Shared: Single-player · Steam Achievements · Custom Volume Controls

Assassin's Creed® Unity
Shared: Single-player · Steam Achievements · Custom Volume Controls

Fallout 4
Shared: Single-player · Steam Achievements · Playable without Timed Input

Just Cause™ 3
Shared: Single-player · Steam Achievements · Custom Volume Controls

The Drifter
Shared: Single-player · Steam Achievements · Custom Volume Controls

Scritchy Scratchy
Shared: Single-player · Steam Achievements · Custom Volume Controls

Chill with You : Lo-Fi Story
Shared: Single-player · Steam Achievements · Custom Volume Controls

Dispatch
Shared: Single-player · Steam Achievements · Custom Volume Controls

Deskrawl: Idle ARPG
Shared: Single-player · Steam Achievements · Custom Volume Controls

Assassin's Creed® Odyssey
Shared: Single-player · Steam Achievements · Custom Volume Controls

DARK SOULS™ III
Shared: Single-player · Steam Achievements · Custom Volume Controls

Halls of Torment
Shared: Single-player · Steam Achievements · Custom Volume Controls

NieR Replicant™ ver.1.22474487139...
Shared: Single-player · Steam Achievements · Custom Volume Controls

Poker Night at the Inventory
Shared: Single-player · Steam Achievements · Custom Volume Controls