This was interesting from a min-max perspective. I like how you have to calculate your returns to try to maximize how many points you can get, and how the potential score delta increases exponentially as the game progresses. It provides for a very compelling and heart-racing endgame.
I found the WASD controls kind of anxiety inducing- I don't know why exactly, but maybe because the targets were so small that you require accuracy while using a control scheme that doesn't allow for refined control of the player movement.
Overall it's a neat concept. I think with a different set of sound clips to ease the anxiety rather than promote it, plus larger colliders and/or a less 8-way (maybe follow-the-mouse?) movement this game would prove really addicting. :D
Maybe you could just halve the timescale to see if that solves the anxiety issue by giving the player more time to make adjustments.
Good job!