Yah, as Shinobody said, the text is too large for your textboxes. Could be a browser issue (Chrome) I couldn't even read the level numbers. I found the 'levels' concept to be annoying and break up the game. One 'endless' level where the difficulty increases would have been much better. You could have had a time counter and added 'checkpoints' at every 1 minute interval instead.
Also, adding in different shapes and rotations and directions of movement would be a really easy way to change this game from boring to fun, especially since this game type has been done many times before... you really need to add something new.
Reviews for "Dodger"
Interesting but maybe if you had some techno and a longer more challenging level then just simple things. It was too short, too quick and almost boring yet the simplicity was good. Great idea for a game, just spice it up a bit and it would be a good one. Nice potential but as is, not my type of of game.