Very cute first game!
I love how you make the jump feel floaty to emphasize we're on the moon, but also give the player some control over the height. You seem to have accomplished that by tweaking the gravity values, based on whether the jump button is help down, right? It felt a bit counter-intuitive the first few times around, but I got the hang of it.
I usually go for cutting the upwards velocity in half or so when the button is released for some finer control when ascending, so I'd advise giving that a try and seeing how you like it, but I have never made a platformer with literal moon physics, so ymmv.
I also really like the visuals here - in particular the little sprite used for when Perona falls into a hole! There's a lot of attention to detail on display: the flopping of the ears, the little blinking animation, the way she looks downwards when falling.
A critique I would make is to make sure to have a clear distinction between foreground and background. There's a part on the hill where there's an invisible "step up", which could have more obvious borders, or be made into a gentler slope. While that's not a problem in this tiny demo, it could easily be if there were more complex platforming or enemies to avoid.
All in all, very promising work here. Keep it up!