Very nice actually! You also have quite the large amount of levels layed out, took me a while to complete. I also think the hitbox size shrinks while dashing? I used it to dash through some boxes while they toppled over, that was cool. It's also good that the hitbox of the flags extends vertically more like a goal line, because I overshot quite a few of them and would have had to redo the section.
I really enjoyed the one where you were accelerated to hyperspeed and ram into the pile of boxes. For some reason that turned me into a gamer temporarily because I first-tried the next three sections. I love games where you are just super fast. Also +1 for pause screen and the time refilling while standing on a flag!
Sometimes the cycle based obstacles like the spikes can come at the most inconvenient timing for some of the levels, such as level 8, but maybe that was just me because I did not notice flag 9 down there, so I managed to get to flag 10 just in time and skipped the middle one lol. The sound that appears while you have died and continue to fall into the void is quite ominous.
Very nice!