Sluggish movement, lack of sounds, low difficulty
The lack of a amount of "total lives" makes it easy to win... in fact, you don't even have to dodge; the enemies (not even the boss) have bullets firing at you. The fact that your character is unbearably slow makes it less tolerable to play the game, and the lack of sounds is another crippling feature of this game.
On the other hand, the visuals and the concept involved were good enough. Take what you have here, and improve on it.