Putting aside the theme of GBTK, the gameplay is very cool (hitting a wall doesn't mean you have to restart) and the one sound effect is nice.
Story is a bit hard to grasp, though 🙃 and it's easy to make the game lag on big levels although only if you are trying.
This is probably the shortest real game I have ever played which I think is good since I had fun during the less-than-2-minutes it took me to finish it. Now you only have to make 60 games like this one so I can have fun during 2 hours.