Worse than 'helicopter'. Needs tuning.
First I hit a blue sphere, thinking I had to collect it. 2nd game, I died within seconds, as the physics are different to what I expected. 3rd game, I died at 46k. It had gotten repetitive and ceased to be interesting well beyond that - to be honest, I was just carrying on to see what would happen.
In this game, we rise/fall a lot slower than in most other games of its ilk. Its disconcerting but does distance itself slightly from others and the direction of the arrow works well to show the current velocity.
It kinda means we need to plan our moves a bit further in advance.
The music was a tad repetitive (got repetitive before the song ended) but suited the atmosphere well.
Graphics were decent - 'vector' look suits it. Though maybe keep blue circles off of the yellow blocks.
My main gripe is definitely the difficulty curve - or the lack of one. You need to make the cave thinner, add more circles or do something else to keep upping the challenge and add an algorithm of course, to ensure it's always possible to fly through (although maybe not HUMANLY possible at the upper limit...)
In the end, it's not only unoriginal, but also far worse than the elegant simplicity of the original 'helicopter' game.