Pretty fun, to be honest.
Pressing A and D to move, but then space instead of W is just plain confusing.
My left hand wants to press W, and my right tries to press space, all the while trying to move the character left and right with A and D.
However, I've found a solution that works for me.
I control A and D with the fingers either side of my middle finger, which I hold suspended slightly above the S key.
I press space with my thumb.
I don't like the "hold space to jump further" thing.
It just makes it more awkward.
The graphics are OK. They get the job done. Could be a bit better, though.
Gameplay is fun and addictive. The rank system is fun and just adds to the replay value.
All in all; a fun game with a few simple issues. Very enjoyable if you can deal with the controls.