Hey, thanks for the feedback! I appreciate it! That bug is in fact a bug, the bug being that if you're not quick to release the direction you are pushing you'll start moving right away in the next level. I need a delay before I accept input so people don't do that! Things you learn after you've submitted your first game, right?
And yeah, I could for sure use more art for the exit, a slipping sprite for the player, and probably a background in general :)