diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8289f1e..2f9badd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -35,7 +35,7 @@ cleanup-build:
     CLEANUP_PATH: $CI_BUILDS_DIR/$CI_RUNNER_SHORT_TOKEN/$CI_PROJECT_NAME-build-$CI_PIPELINE_ID
   script:
   - echo "cleaning up build directory"
-  - rm -r $CLEANUP_PATH
+  - rm -r $CLEANUP_PATH $CLEANUP_PATH.tmp
   dependencies:
   - build
 
diff --git a/ci/build.sh b/ci/build.sh
index 559e7ab..b1f0935 100644
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -3,7 +3,7 @@
 # $1    UNITY_VERSION
 unityversion=$1
 
-editorlogpath="$HOME/Library/Logs/Unity/Editor.log"
+editorlogpath="$(pwd)/Editor.log"
 editorpath="/Applications/Unity/Hub/Editor/$unityversion/Unity.app"
 
 # remove previous Editor.log
@@ -21,16 +21,39 @@ open -g $editorpath --args \
     -logFile $editorlogpath \
     -projectPath "$(pwd)/game"
 
-# wait for unity to exit
-while pgrep -x Unity > /dev/null
+# use a safe directory that is automatically removed by the shell when the script exists
+work="$(mktemp -d)" || exit $?
+trap "rm -rf '$work'" exit
+
+# default exit code
+echo 1 > $work/exitcode
+
+# start tail in a subshell and store its pid, then read line by line to determine build result
+(tail -n 1 -f $editorlogpath &
+    jobs -p %% > "$work/tail.pid"
+) | while read line
 do
-    sleep 1
+    echo "${line}"
+
+    # check for build success
+    if [[ $line == *":: ktyl.build completed with code 0"* ]]; then
+        echo 0 > $work/exitcode
+    fi
+
+    # check for exit
+    # TODO: ideally we should have a better indicator than the package manager's shutdown message
+    if [[ $line == *"[Package Manager] Server::Kill -- Server was shutdown"* ]]; then
+        echo "exit loop"
+        break
+    fi
 done
 
-if [ -f $editorlogpath ]; then
-    echo "build completed, dumping log"
-    cat $editorlogpath
-    echo "TODO: check result of build by looking at the last few lines"
-else
-    echo "no editor log to dump?"
-fi
+# kill zombie tail process
+kill $(<"$work/tail.pid")
+
+exitcode=$(cat $work/exitcode)
+echo "exit $exitcode"
+
+exit $exitcode
+
+# vim: tabstop=4 shiftwidth=4 expandtab
\ No newline at end of file
diff --git a/game/Assets/Scripts/Util/Editor/Build/BuildCommand.cs b/game/Assets/Scripts/Util/Editor/Build/BuildCommand.cs
index 686ee45..45f3bcf 100644
--- a/game/Assets/Scripts/Util/Editor/Build/BuildCommand.cs
+++ b/game/Assets/Scripts/Util/Editor/Build/BuildCommand.cs
@@ -3,6 +3,8 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using UnityEditor;
+using UnityEditor.Build.Reporting;
+using UnityEditor.Compilation;
 using UnityEngine;
 
 namespace Ktyl.Util
@@ -44,7 +46,12 @@ namespace Ktyl.Util
                 target = BuildTarget.StandaloneWindows64
             };
 
-            BuildPipeline.BuildPlayer(options);
+            var report = BuildPipeline.BuildPlayer(options);
+            var result = report.summary.result;
+            if (result == BuildResult.Succeeded)
+            {
+                Debug.Log(":: ktyl.build completed with code 0");
+            }
 
             // TODO: post-process
         }