Wow I suck hard on it :D It was kinda fun to analyze where exactly I failed & why and where I need to jump a bit longer or make a slower/faster dash; but yeah, checkpoints would be nice as others have stated. I actually kinda liked the "Ice skate" feeling because it's a slime, so it kinda makes sense (though "Sticky to everything" could make sense as well). Graphics & dialogue are happily reminiscent of the Flash games era, but a couple more sounds here and there or a reeeeally simple music loop would be nice. Overall nice job!