Hello!
I finally had time to test it more thoroughly, and I must say it runs way smoother now, particularly in the end game, but on low end browser like my Kindle Paperwhite, the game still lags a little, but the most annoying is the zoom level changing each frame.
I think adding an option to rotate the screen 90 degrees would help a lot to remove that problem, but it might require too big changes (Is there a way to do it without changing each drawing and positionment instructions?) Anyway I understand e-reader aren't made to play games, but it would still be nice...
Thanks!