It makes me really happy that you managed to stick with my game even if it wasn't your type and managed to pull it off to finish Level! Congratulations!
You can also use the spacebar to jump. It's a hard-coded secondary key which should make your experience a bit better better. I am working on key rebinding right now, which is always a bit of annoying work to do in Unity.
I totally did not know about any custom webgl template! I will check it out right now! Thank you for this recommendation!