Suro
I tried this version again
newgrounds.com/portal/view/612273
I ctrl-F5 just in case
I click on the play button. Pressed space-bar and the browser shot to the bottom of the screen.
I scrolled up with my mouse, clicked on the game and now the spacebar worked as expected.
I then clicked on the surrounding area and bang the space bar shoots me down again.
I have tried it a few times since and it continues to be erratic at best.