This is your first project, right? It's very impressive if that's the case.
As far as the game itself, it desperately needs more SFX and walls to stop players from walking off the world. I understand it's supposed to be inspired by some old game, but I dislike the way weapons work and would prefer if the equipped weapon was on the screen like all modern RPGs, or at the very least displayed somewhere in the HUD.
Combat is not super engaging, but may be helped by adding a larger variety of enemies. If there was a ranged enemy attacking at the same time, the slimes wouldn't be so trivial (boring) to fight. Also proper sound effects and a recoil animation would go a long way towards making combat feel good.
The art style is charming in a retro way, but the gameplay needs more attention and the lack of sound effects is seriously hurting the game. Even some generic looping background music would improve things a lot. If I were to suggest what to prioritize, it would be getting a few more types of enemies and seeing what kind of combinations make for the most engaging combat, as well as working on sound effects. Also the "exit" button on the menu made me think it would exit the game, not just exit them menu.
Looking forward to see how this project evolves over time! If you're this far on your first project, you seem capable enough to turn it into something great.