I love how simple the game is, it's very easy to understand. The art is very good, it's simple but I like how you add details, like blood on the wall when the HP is low. The bgm is fitting with the situation, also love the detail with how it got slower the lower the HP is.
The problem I found is for the upgrade, I can only choose the middle one and it's hard to take the upgrade, because the enemy still can attack me when choosing an upgrade.
The game is fun, even though it's kind of hard, especially when the enemies start showing up here and there. Overall, I will play it again if you make it into a full game.