I like the idea of the game, the artstyle and graphic effects.
What I would improve is auto-switching your weapon of choice with Q key without the need to select it with mouse and making the enemy death more visible. I would also be happy somehow made the stab attack hitbox more visible and maybe increase it. There needs to be some indication of the boss or a way to escape from its room, since I entered the boss unprepared and got locked with the limited equipment I had. I'd also make bigger enemies drop more coins or just make hp and arrows cheaper.
Although there are things to improve to make the game feel even more fun, the game is great as it is. I love the fact that you can take different paths in map and there are different endings.