Show HN: Skub – a sliding puzzle browser game

It's interesting, couple of things you can fix/change:

1. It's annoying to be asked to provide username every time I complete a level. Can you simply remember my previous choice? Instead something like next level button would be my preference.

2. Tab works until it stops working, it will switch between game elements and then at one point it will focus on buttons (firefox, windows).

On the game page, pressing the browser's back/forward buttons changes the game state instead of navigating between pages. It would be great if undo/redo had their own dedicated buttons, and the browser back/forward worked as normal page navigation (e.g. going back to the main menu).