Brilliant.
Excellent idea, very good realisation.
That's quite a simple game in its conception, and there's no need to wonder a lot to understand it.
Though, it's perfectly done. Really effective, and doesn't waste any time (with purged menus). Good choice of music, quite stressful and heavy. The timing is perfect between the moment you realize where are the gaps and when the gates close and the controls are absolutely not glitchy.
Well done, it's really good and i guess very addictive.