Didn't disliked the level, but there were a couple issues I had with it, I enjoyed that the level wants to test the player's reaction times, but:
The level is very poorly telegraphed, there are thousands of coins throught out it but I have 0 idea of what any of them are supposed to tell you, and with so much sprite spamming and rushing, even if you theoretically should be able to react to the super koopas, because the spawns of these sprites are so goddamn inconsistent it's still impossible to react to them. I have seen the clear video before and still opted to play the level slowly, I have 0 idea how the judges will interpret this level. Another very concerning thing is that the setups feel very stale after a while, the level just has 3 ideas that it recycles over and over again, and the short level lenght here is two fold, while it helps so the repetitiveness doesn't feels overbearing, it also hurts the potential of the ideas, because at some point it just ends, and because there wasn't enought "meat"
it makes for a not so lasting impression. I feel like the ideas on this are good, but the execution needs a little bit more work.