I like the mechanic to reload the speed by spinning (also feel really good when you have barely no speed anymore, and you reload, it's like in beyblade or some advertise in 2000's). Bosses are fine but maybe too hard, I had a long time on the game before beating the boss 2, then abd for the boss 3 as I got instantly shoted twice xD
Otherwise, LowPoly family ! Good job on this one.