Before I start. I saw that this is incomplete so I'm not going to judge it on that.
I like it, but not because its good. I can see the care you put into this. The story was very short and simple, that's fine and sort of sweet in a way of how it ended. If the gameplay wasn't broken, and the item shop wasn't useless then I would say its a starting point to showing what you can do(but this was an older part of a project so I understand). You have the passion for it. The art on the shopkeeper was quite nice.
To improve your story, you could flesh out the characters more. Like It's too short and simple to make me want to care about them. You might care about them more than me because you made them, you know? If you want other people to be interested then you have to look at it from their side too. Like Snivey and Oshawatt, they felt like the same character to me. So if Snivey was gone then nothing would really change.
I made an account just to comment to you about this, on the chance that you are still on this site, working on something. I care and want to see you improve.