Wow that was quite hard and took me many tries to even understand what was happening :D Wish there had been some sort of ingame tutorial or hint to let the player know what's what. You're really sort of thrown into the water with this game ^^It was fun to figure out how it works though!
I like how many different effects the bugs have and how they can be combined and I'd kind of like to see some more visual indicators of what those effects are, for example when my hits heal the boss, I didn't notice a visual difference except on the hp bar of the boss.
Love your artstyle, totally stands out from the crowd. I like how the boss flashes in missing material magenta when you hit it :D
It's absolutely amazing that you managed to make this alone in such a short time. There's a lot to it :o