Good job in getting a finished game together. I don't mind the there being no custom graphics or sound at all. I can also totally ignore the outside the play area bugs as this was made in just 3 hours. I do feel like the game is just a little bit too easy, as you can always outrun the enemies. So they're never really too much of a threat. A high difficulty can really extend the play time (and fun) of a simple game (I completely understand that there is next to no time to playtest your game in 3 hours so its hard to tweak the difficulty). A respectable entry.