Tweak gravity and player physics

pkg/balance/numbers.go

@@ -33,13 +33,14 @@ var (
 
 	// Player speeds
 	PlayerMaxVelocity       float64 = 7
-	PlayerJumpVelocity   float64 = -23
+	PlayerJumpVelocity      float64 = -15
 	PlayerAcceleration      float64 = 0.04 // 0.12
 	PlayerFriction          float64 = 0.1
 	SlipperyAcceleration    float64 = 0.02
 	SlipperyFriction        float64 = 0.02
-	Gravity              float64 = 7
-	GravityAcceleration  float64 = 0.1
+	GravityMaximum          float64 = 7    // max pull of gravity
+	GravityAcceleration     float64 = 0.25 // normal gravity acceleration downward
+	GravityJumpAcceleration float64 = 0.05 // gravity while jumping upward (smoother jumps)
 	SwimGravity             float64 = 3
 	SwimJumpVelocity        float64 = -12
 	SwimJumpCooldown        uint64  = 24 // number of frames of cooldown between swim-jumps

pkg/uix/actor_collision.go

@@ -73,14 +73,23 @@ func (w *Canvas) loopActorCollision() error {
 			// Apply gravity to the actor's velocity.
 			if a.hasGravity && !a.Grounded() { //v.Y >= 0 {
 				if !a.Grounded() {
-					var gravity = balance.Gravity
+					var (
+						gravity      = balance.GravityMaximum
+						acceleration = balance.GravityAcceleration
+					)
 					if a.IsWet() {
 						gravity = balance.SwimGravity
 					}
+
+					// If the actor is jumping/moving upwards, apply softer gravity.
+					if v.Y < 0 {
+						acceleration = balance.GravityJumpAcceleration
+					}
+
 					v.Y = physics.Lerp(
 						v.Y,     // current speed
 						gravity, // target max gravity falling downwards
-						balance.GravityAcceleration,
+						acceleration,
 					)
 				} else {
 					v.Y = 0