Interesting base you have here, but I think it needs a lot of work if you intend to turn this into a bigger project.
I’ll echo the previous comments by saying, very cute model, but a lot of small issues with the movement that make it never really feel that cohesive and get you into that “flow”. But I think the other comments have given you plenty of feedback on that, so instead I’ll say that you should be thinking about what kind of game you want this to be.
Right now, it feels like a tech demo, just a linear series of rooms with jumps. Even saying there’s puzzles feels like a stretch. Do you want it to be all about platforming? In that case, is it even a good idea for this to be a Metroidvania? Would you be better off just making a level-based platformer? There’s no exploration showcased in this build, do you want that to be a part of this game? It doesn’t seem like you currently have a clear vision, which is fine for a MVM entry, but since it seems like you intend to develop this into something bigger, I’d definitely recommend you spend some thinking about what you imagine this game to really be about when it’s done.
Good luck if you do keep working on it, this could go somewhere if you commit to it!