Funny thing: I've directly clicked on hard, so i didn't notice at first what happens if you click the others, this is why i restart games after playing :D
The collision sometimes felt a bit off, i know that it's accurate but lower refresh screens can suffer from ghosting at such high movement speeds, if you want the collision to be more permissive to say so, you could reduce the collider size between a 2 and a 10% in size (in the collider componen's properties). That way if in example you clip only the very corner, you can still make it through.
Overall, it's nice and fun even if it's a bit hard. I'm used to games where you have to react super fast, and it took me 3 attempts to finish.
One last thing, even if you make a HTML build, always consider the game as a separate thing from the webpage/game description, and try to include the controls and instructions inside the game as well.
Getting experience doing tutorials is super important because that's how you present the game to the public usually, when they get hands-on with it.
Cheers! ;)
If you want, after the voting period ends, I'd encourage you to add music and sound effects to it, and maybe a extra level or two. Congratulations on your first jam submission :D