Very nice little puzzle game! Really loved the hooks in some of these puzzles - spent a couple minutes on level 5 trying to figure out how to squeak out an extra tile movement, and level 6 was a really clever use of the portal mechanic especially! Great stuff!
(Also, I'm pretty sure I solved level 8 "on-paper", but there was a bug with the second ghost that kept me from finishing - oh well)
Something that might help ya out in the future - for visuals, it's usually easiest (especially for pixel games) in Godot to go into Project Settings -> Display -> Window, and setting the Viewport Width and Height to something that scales nicely (I find 640 by 360 tends to work for most monitor resolutions), then under Stretch on that same page, change mode to "Viewport". This wasn't that big of a deal with this game, and it was still purrfectly playable in browser! Definitely an entry worth being proud of - good stuff! :D