The controls don't seem to be too responsive resulting in hitting space more than once for the desired results and many deaths. You should also make an alternative control, like instead of just arrow keys let the player use WASD as well.
The music that plays is also not enjoyable and I found my self hitting the mute button very fast for its gloom noises and repetition.
With a little work on the control scheme, this could very well be a front paged game with a high score! Hope to see more from you.