Ah yes I totally agree. I was unfortunately running short on time on this entry, as I spent more time than usual on making the sprites. At first, the eyes just disappeared and reappeared. And with only a bit of time, I managed to make the eyes red on the one frame where they got hit, and yellow on the one frame where they appeared. I agree it's not very much. Same with the red-lightning attack thing, it's only visible for one frame. It mostly came down to me not having an entity system in this game. Something I've been thinking about writing a template for so that I can reuse it in future jams.
In regards to how I came up with the idea, I don't really remember! haha :P it was friday morning, and i was tired and had to make a game in 3 hours :D