Played the game and a few things I noticed. 
First, On the loading screen before entry into level 1 some of the words were cut off on the screen and wasn't legible.
Second, when I played the game in level 1 and 2, I noticed that jump with the up-arrow key doesn't work properly. 
Third, I noticed in level 2 that when the snakes pushed me back, I went off the level screen to the left side (pushed off the actual map but didn't reset.)