I'm not the best at art so I didn't make more than 2 enemy sprites. I do understand that it makes it confusing with varying HP and damage.
I didn't have any idea for a special/original mechanic, you're right :(
What I focused the most on was to make the gameplay feel good, so I guess I managed to pull it off. I'm getting a lot of mostly positive feedback, so I'm most likely going to remake the codebase and recreate this game with more than 1 stage.