There are lots of different systems here, it's quite ambitious for a jam game! Unfortuantely I ran into a few issues that really prevented me from playing. The first time I ran it, I got told to go to the shop and buy something - but I couldn't exit the shop menu! Then, after reloading, I wasn't told to buy anything and didn't seem to have any money. I found the teleporter, but then couldn't attack at all. Sorry! I tried a few times and couldn't get it to work. If there's something specific I need to do, let me know and I'll give the game another go.
Once those bugs are fixed, I think the first thing to work on is the UI - it's very cluttered, and feels like almost no effort was put in with it. I'd at least grab a font from https://fonts.google.com if I were you, and spend a little time thinking through layouts so the UI doesn't overlap. You also need to pay attention to things like text colour, because it sometimes blends in with the background and is difficult to see.
I like the isometric art style, but I felt like the player sprite should at least get mirrored so you don't spend half the time walking backwards. The music works well, too, and the "quest" system that told me where to go with a big line worked really well the first time! I like that sort of thing.