Nice game! I especially like the artwork. As others have said, it's a nice retro-aesthetic.
I think my biggest complaint is that the enemies don't feel fair, especially the small walking enemies. The reason is that their movement seems to be completely random and unpredictable, which given the short range of the sword meant I lost several dozen HP to the enemy turning around randomly when I was trying to hit it. This is especially frustrating since the combination of large player hitbox and small range of attack meant that the reaction time to save myself from damage is basically none.
I think adding a bit of telegraphing to some of the more random enemies would go a long way (such as the shooting plants and the small minions). As a good example of an enemy that really fit this game, I really liked the enemy design of the bats since predicting their movement and parrying just before they were in range was super rewarding as a player.