diff --git a/src/enter_stage/systems.rs b/src/enter_stage/systems.rs
index d28bfcd..96e401e 100644
--- a/src/enter_stage/systems.rs
+++ b/src/enter_stage/systems.rs
@@ -1,7 +1,7 @@
 use std::time::Duration;
 
 use crate::{
-    game::prelude::{EnemySpawn, SplitTimer, Stage, StageHandle, Wave},
+    game::prelude::{EnemySpawn, SplitTimer, Stage, StageHandle, Wave, WaveSpawnCount},
     GameState,
 };
 use bevy::prelude::*;
@@ -31,6 +31,7 @@ pub fn setup_resources(
         Duration::from_millis((stage.split_interval_secs(0) * 1000.0) as u64),
         TimerMode::Repeating,
     )));
+    commands.insert_resource(WaveSpawnCount(0));
 }
 
 pub fn show_stage_intro(
diff --git a/src/game/components.rs b/src/game/components.rs
index acba8c2..a6df4b4 100644
--- a/src/game/components.rs
+++ b/src/game/components.rs
@@ -4,6 +4,7 @@ use bevy::{prelude::*, utils::HashSet};
 use derive_more::From;
 
 pub const PLAYER_MISSILE_SPEED: f32 = 250.0;
+pub const MAX_AMMO: u8 = 30;
 
 #[derive(From)]
 pub enum Scoring {
@@ -171,7 +172,7 @@ pub struct TextColor;
 #[derive(Component)]
 pub struct DropBombTimer(pub Timer);
 #[derive(Component)]
-pub struct MissileReserve(pub usize);
+pub struct MissileReserve(pub u8);
 #[derive(Component)]
 pub struct City;
 #[derive(Component)]
diff --git a/src/game/mod.rs b/src/game/mod.rs
index 03a2580..5a19aeb 100644
--- a/src/game/mod.rs
+++ b/src/game/mod.rs
@@ -7,9 +7,10 @@ use self::{
     systems::{
         ammo_ui, animate_sprite_indices, animate_sprite_steps, change_colors, defeat, drop_bombs,
         explode_city, explosion_event_listener_system, explosion_system, flame_engulf_system,
-        game_keys, game_over_ui, gizmo_missile_trails, missile_arrival_event_listner, move_cursor,
-        move_missile, move_ufo, reset_game_listener, rotate_player, score_ui, setup_player,
-        spawn_enemies, split_missiles, teardown, wave_ui,
+        game_keys, game_over_ui, gizmo_missile_trails, is_wave_finished,
+        missile_arrival_event_listner, move_cursor, move_missile, move_ufo, reset_game_listener,
+        rotate_player, score_ui, setup_player, spawn_enemies, split_missiles, teardown,
+        wave_complete, wave_ui,
     },
 };
 use crate::GameState;
@@ -46,7 +47,9 @@ impl Plugin for GamePlugin {
                         flick_system,
                         change_colors,
                         (
-                            spawn_enemies,
+                            spawn_enemies.run_if(
+                                in_state(GameState::InGame).and_then(not(is_wave_finished)),
+                            ),
                             split_missiles,
                             move_missile,
                             gizmo_missile_trails,
@@ -63,6 +66,8 @@ impl Plugin for GamePlugin {
                         rotate_player,
                         defeat,
                         stage_colors.after(spawn_enemies),
+                        (wave_complete)
+                            .run_if(in_state(GameState::InGame).and_then(is_wave_finished)),
                     )
                         .run_if(in_state(GameState::InGame)),
                     // run these systems if we are in the GameOver state
diff --git a/src/game/prelude.rs b/src/game/prelude.rs
index 4b1e01e..7925088 100644
--- a/src/game/prelude.rs
+++ b/src/game/prelude.rs
@@ -114,3 +114,5 @@ pub struct EnemySpawn(pub Timer);
 
 #[derive(Resource)]
 pub struct SplitTimer(pub Timer);
+#[derive(Resource)]
+pub struct WaveSpawnCount(pub usize);
diff --git a/src/game/systems.rs b/src/game/systems.rs
index c68f50a..b908a09 100644
--- a/src/game/systems.rs
+++ b/src/game/systems.rs
@@ -15,10 +15,10 @@ use super::{
         City, Cursor, Destroyed, DropBombTimer, Enemy, Engulfable, Explodable, Explosion,
         ExplosionEvent, ExplosionMode, FlameRadius, Foreground, Health, IdCounter, Missile,
         MissileArrivalEvent, MissileReserve, Player, Score, Scoring, SpawnPoint, Stepper,
-        TargetLock, Ufo, PLAYER_MISSILE_SPEED,
+        TargetLock, Ufo, MAX_AMMO, PLAYER_MISSILE_SPEED,
     },
     effects::{Flick, TimedRemoval},
-    prelude::{color_from_vec, EnemySpawn, SplitTimer, Stage, StageHandle, Wave},
+    prelude::{color_from_vec, EnemySpawn, SplitTimer, Stage, StageHandle, Wave, WaveSpawnCount},
 };
 
 pub fn game_keys(
@@ -198,6 +198,28 @@ pub fn split_missiles(
     }
 }
 
+pub fn is_wave_finished(
+    stage: Res<StageHandle>,
+    stages: Res<Assets<Stage>>,
+    wave: Res<Wave>,
+    spawn_count: Res<WaveSpawnCount>,
+) -> bool {
+    let stage = stages.get(&stage.0).unwrap();
+    stage.enemies_count(wave.0) <= spawn_count.0
+}
+
+pub fn wave_complete(
+    mut wave: ResMut<Wave>,
+    mut spawn_count: ResMut<WaveSpawnCount>,
+    mut missile_ammo: Query<&mut MissileReserve, With<Player>>,
+) {
+    wave.0 += 1;
+    spawn_count.0 = 0;
+    for mut ammo in missile_ammo.iter_mut() {
+        ammo.0 = MAX_AMMO;
+    }
+}
+
 pub fn spawn_enemies(
     mut id_counter: ResMut<IdCounter>,
     mut commands: Commands,
@@ -208,6 +230,7 @@ pub fn spawn_enemies(
     stage: Res<StageHandle>,
     stages: Res<Assets<Stage>>,
     wave: Res<Wave>,
+    mut spawn_count: ResMut<WaveSpawnCount>,
 ) {
     enemy_spawn.0.tick(time.delta());
 
@@ -217,12 +240,13 @@ pub fn spawn_enemies(
 
     enemy_spawn.0.reset();
 
-    let mut rng = RngComponent::from(&mut global_rng);
     let stage = stages.get(&stage.0).unwrap();
+    let mut rng = RngComponent::from(&mut global_rng);
 
     // spawn ufo
     if rng.chance(stage.ufo_chance(wave.0)) {
         spawner::ufo(&mut commands, &mut rng, images.cursor.clone());
+        spawn_count.0 += 1;
     }
 
     for _ in 0..=rng.usize(stage.missile_spawn_min(wave.0)..stage.missile_spawn_max(wave.0)) {
@@ -234,6 +258,7 @@ pub fn spawn_enemies(
             &stage,
             None,
         );
+        spawn_count.0 += 1;
     }
 }
 
@@ -652,7 +677,7 @@ pub fn setup_player(mut commands: Commands, images: Res<ImageAssets>) {
             Player,
             Cannon,
             Health { max: 3, current: 3 },
-            MissileReserve(30),
+            MissileReserve(MAX_AMMO),
             Foreground,
         ))
         .id();