That was very short, but it's serviceable.
The title screen and splash art are gorgeous, I really like them, and I also love the heroine's pixel art design, and her animations are very charming, she kinda reminds me of Metal Slug in some sense, despite having a very different artstyle.
I really like gunslinger characters in general, it's really fun to see them just solving all of their problems with lead in a way or another, like the way the shotgun was implemented as mainly a movement tool that just happens to damage enemies, that was super cool!
Movement felt okay-ish, there is nothing inherently wrong with it, it just lacks some polish. For instance, there is no coyote time, wich is kinda essential for characters that moves at high speeds like our little friend here, and everything also feels a little too weightless, I don't really know how to explain, but it's mostly due to how the animations doesn't quite flow super well with what is happening. Like, the character moves way faster than her walk cycle implies, and there is no animation for actually using the shotgun, wich kinda uhhh..... Makes it look like she is just super farting, I'm afraid x)
(I mean looking at it again, it seens like the blast comes off from her boots? Either way, it felt too subtle for something that I think should be way more dramatic, if you get what I mean)
I like the idea of the reloading mechanic, but I think it could be more refined. For instance, it should give better visual feedback aside from just writing it on the HUD.... Coming back to Metal Slug, an animation for that state would be the most ideal, but since that is definitelly a lot of work to do, just a few particles affected by gravity coming out the character to show the old rounds being discarded, or something like that would be great! Information like these that limits the player's action while they're on the middle of acting should be extremelly on the nose, since if the player is focused on the immediate gameplay like platforming or fighting, they won't really have their eyes on the hud at the moment, and subtle changes to it are harder to be noticed by peripheral vision.
I think that's all I have to say about this one. It's charming, but it also is sadly a little too short to really start enjoying it, but I understand this was probably a time constraint issue, I appreciate that you released it at all, that's already great