Thank you so much for the kind words! I'm glad you enjoyed it, and really happy you enjoyed the graphics. For some reason I really got into the pixel art here and had a blast making these little sprites, so I'm glad the presentation stands out. And yeah, the speed power up is fast, probably too much for a mobile game haha. Would you believe me if I said it used to be faster?
Also, if you want to practice your speed control, on the title screen you can hold the B button (Z on PC) and press down, down, up, up, up, up to unlock speed-up mode. I don't know if that makes the game easier or harder LOL