I quite like the concept, I felt like I was gambling my life, it would be great to accentuate the feeling of you can actually die by messing up but overall pretty great. I thought it was confusing at times but I figured out in the end most of the elements. The facct that the payoff is lower the more time you take hit me when I was pretty much at the end, I didn't figure it out before then. At the start I felt as if there was no difficulty ramp up but you start to feel it at like 6-7 sector. Honnestly before that not really. Maybe adding some different elements of challenge to the game would be interesting, directly to the time spin or a side part of gameplay like multitasking to manage/maintain the spaceship while moving through time or something. I didn't use the overclocks, not 100% sure if they were actually implemented in the game but seemed interesting.
Anyhow, nice game and concept, it would be cool to see a full fledged version of this. wheter you work on it or not, keep it up and good luck!