diff --git a/Makefile b/Makefile
new file mode 100755
index 0000000..403f5c9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+SHELL:=/bin/bash
+
+all: build stat clean
+
+build:
+	rm -f muri-src.zip muri.zip src/muri.min.js
+	uglifyjs --compress --mangle --no-dead-code --output src/muri.min.js src/*.js
+	(cd src && zip -q -9 ../muri.zip index.html muri.min.js assets/* assets/**/* vendor/*.min.js)
+	(cd src && zip -q -9 ../muri-src.zip ./* ./**/* ./**/**/* ../README)
+
+.ONESHELL:
+stat: build
+	@filesize=`stat --printf="%s" muri.zip` && \
+	echo $$filesize "byte ->" $$((100*$$filesize/13000)) "%"
+
+clean:
+	rm -f src/muri.min.js muri.zip
+
+.PHONY: build stat clean all
diff --git a/build.sh b/build.sh
deleted file mode 100755
index a942c2b..0000000
--- a/build.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-
-rm -f muri-src.zip muri.zip src/muri.min.js
-uglifyjs --compress --mangle --no-dead-code --output src/muri.min.js src/*.js
-(cd src && zip -q -9 ../muri.zip index.html muri.min.js assets/* assets/**/* vendor/*.min.js)
-(cd src && zip -q -9 ../muri-src.zip ./* ./**/* ./**/**/* ../README)
-
-filesize=`stat --printf="%s" muri.zip`
-echo $filesize "byte ->" $((100*$filesize/13000)) "%"
diff --git a/src/muri.min.js b/src/muri.min.js
deleted file mode 100644
index ab3b5f3..0000000
--- a/src/muri.min.js
+++ /dev/null
@@ -1 +0,0 @@
-"use strict";var muri=function(){kontra.init("js13k-2017"),kontra.assets.imagePath="assets/images";var t={},r=function(t){return kontra.sprite({x:0,y:0,image:kontra.assets.images["room_"+t]})};return t.modules=[],t.start=function(){kontra.assets.load("player.png","room_stasis_dark.png","room_stasis.png").then(function(){document.getElementById("loading").style.display="none",null===kontra.store.get("current-room")&&kontra.store.set("current-room","stasis_dark");var s={stasis_dark:r("stasis_dark"),stasis:r("stasis")};kontra.gameLoop({update:function(){var r=kontra.store.get("current-room");s[r].update();for(m in t.modules)m.update()},render:function(){var r=kontra.store.get("current-room");s[r].render();for(m in t.modules)m.render()}}).start()})},t}();window.onload=muri.start;
\ No newline at end of file