I finally was able to beat it! My best time was 48.62, but I never managed to figure out the best strat for doing the carrot-less challenge. This game is super cute and I really like the subtle music change between different speeds. Like it's just enough to notice, but it's not jarring or annoying (even when you collect carrots and it goes back and forth, still sounds smooth).
I think my only criticism is how slippery the controls are. The ability to jump off of slopes super high is actually kinda neat, but I feel like the tradeoff is that I don't feel totally control of Shrinky and find myself bumping into things a lot. (I will say again that I love gamepad controls and that might help, but idk if you can use gamepad in HTML5 games).