I love the simple and minimalistic art style, it keeps the game from becoming too crowded and overwhelming. The idea for this game is great and it is executed well. The enemies add a nice layer of difficulty, especially in that their position is relative to the screen and not the landscape. This is a great game!
One note- I noticed a possible bug in that when the player died in paused time, the screen did not reset and I had to reload the page. That was my only complaint, and it didn't bother me all that much. :)