diff --git a/CREDITS.txt b/CREDITS.txt
index 46bc5a8..a8457bd 100644
--- a/CREDITS.txt
+++ b/CREDITS.txt
@@ -1,5 +1,6 @@
 - `assets/leaf-ranger.png` is licensed under CC-BY 4.0 and was created by chierit (source: https://chierit.itch.io/elementals-leaf-ranger)
 - `assets/bringer-of-death.png` was created by clembed (source: https://clembod.itch.io/bringer-of-death-free)
+- `assets/flat-ui.png` is ilcensed under CC-BY 4.0 and was created by Crusenho Agus Hennihuno (source: https://crusenho.itch.io/complete-gui-essential-pack)
 - `assets/small-blocky-font.png` is licensed under CC-BY 3.0 and was created by Jerom (source: https://opengameart.org/content/small-blocky-font)
 - `lib/classic.lua` is licensed under the MIT license and was created by rxi (source: https://raw.githubusercontent.com/rxi/classic/master/classic.lua)
 - `lib/push.lua` is licensed under the MIT license and was created by Ulysse Ramage (source: https://github.com/Ulydev/push)
diff --git a/assets/flat-ui.png b/assets/flat-ui.png
new file mode 100644
index 0000000..d9ed932
Binary files /dev/null and b/assets/flat-ui.png differ