The controls are very unresponsive, I often found myself dying because the jump button didn't make me jump or I didn't stop moving right even though I took my finger off the right arrow.
I don't think the music entirely fits in with the game. Perhaps some music that sounds like it might actually come from the device shown in the game would have fit in better.
It's also quite unclear how to actually leave, which I suppose is the point, but it would be nice if you could actually figure it out. The room that the 'secret' is in is nicely indicated, but the actual route you have to take can only be found by jumping into walls until you find it.
Other than that, it was a good game, nothing fantastic but it was fun to play.