Look at one important interaction and list the signals it produces. Movement, sound, text, animation, color, and changes in the world can work together. They should reinforce the same meaning rather than create conflicting messages.
Make cause and effect understandable
Keep the response close enough in time and place for the player to connect it with the action. If a result is delayed, communicate the waiting state. If an action is unavailable, explain the relevant condition instead of silently ignoring input.
Avoid relying on a single sensory cue for essential information. A color change alone may be difficult for some players to distinguish. A quiet sound may be missed on a phone or in a noisy room. Text, shape, position, or another suitable cue can provide support.
Test without explaining over the player's shoulder
Observe whether players notice the result and understand what caused it. If the developer has to narrate every response, the feedback may need improvement. Ask players what they think happened before telling them the intended answer.
Small changes can make a large difference: a clearer selection state, a readable error, or a visible recovery option. Feedback is part of the game's rules as experienced by the player. It deserves design and testing alongside the mechanic, rather than being treated only as decorative polish near release.