First of all, I like the artwork in the game. But that's the only positive thing I can provide.
There are several bugs in the game, including when I've paused the game (using Enter) and I've pressed Enter again and it doesn't get rid of the Pause menu, or it sends me back into the menu. There are times when I couldn't walk back to the previous area and when I can, I goes off-screen until I reach a certain point where you eventually reach the area.
The hitbox is also very large and the boss could do with some more variation.
Furthermore, the Game Over is redundant because it just lets you continue the gameplay, meaning you can just win regardless (also you can pause on the game over)
All I can say is that there is a lot of work that needs to be done.