Nice start! I included it in my Godot Community Jam compilation video series, if you’d like to take a look. :)

Itch app cannot run webgl 2 zzz....

Tried on firefox and could run just fine, just some pointers:

When exporting, do it on release, you need to toggle the badly placed button on the lower right when saving the exported project, that will make it more light and faster.

Be more nice with your instakill elements, reducing a bit the hitbox will result in a better experience.

And add particles, lot of particles (I know is not a good advice for the current state of godot particles shader issues but keep that in mind).

The art is good, and the controls are solid; not many first-timers can pull off a platformer this well. Sound would have been a nice touch, but it's clear that you focused on what mattered.

Awesome job for your first game!  My first game was a bad version of tic-tac-toe.  LOL  I think next time consider adding some sound.  Sound does SOOOO much for a game.  There's lots of free sounds on the net that you can use, or make your own.  Anway, good job!

Nice first project with Godot!  

Congrats on your first Godot Project!

This game is very cute albeit short. The controls were smooth and the tutorial was quick and easy to understand. Good job.