Fun game. A good first showing especially since this is your first time developing a game. I think that having multiple exits to a level is a novel idea and could be expanded upon.
Minor nitpick, but some people might not know what an "obby" is. That's a pretty insular term in a community, and a shortening of a word at that. I think a different title would get more eyes on your game. The 1/7 chance to lose progress in the level feels harsh too.
Additionally, some of the assets (like the player, the text on the title screen, etc.) go off the screen in the web version. I'm sure with a little tweaking that can be solved though. We had this issue before when we were developing in Unity, although I'm not sure if I remember how to fix it.
If I was to expand upon this game, I'd say working on the player controller to make the base movement feel good might be the play here. It would make some of the detrimental effects even more fun to play, like "challenge runs". Leaning more into the fun effects and less into instant failure or forced game reset would be really good.
This is a good showing for so little time and for this being your first foray into programming as a whole. Looking forward to seeing your work in the future and good luck!