Entirely expanded upon existing proof-of-concept

src/player.c

@@ -0,0 +1,39 @@
+#include "player.h"
+
+#include "world.h"
+#include "config.h"
+
+#include "raylib.h"
+
+void UpdatePlayerControls(void)
+{
+    if (!player)
+        return;
+
+    if (IsKeyDown(KEY_A))
+    {
+        ApplyForce(
+            player,
+            (Vector2){-PLAYER_FORCE, 0}
+        );
+    }
+
+    if (IsKeyDown(KEY_D))
+    {
+        ApplyForce(
+            player,
+            (Vector2){PLAYER_FORCE, 0}
+        );
+    }
+
+    if (IsGrounded(player) &&
+        IsKeyPressed(KEY_SPACE))
+    {
+        player->velocity.y = 0;
+
+        ApplyForce(
+            player,
+            (Vector2){0, -JUMP_FORCE}
+        );
+    }
+}