Thank you for playing !
Yeah making art isn't really my cup of tea and from experience I lose alot of time making them that I'd rather focus on the game itself and flesh out all the bugs and playtesting it properly (I'm really more of a coder then a designer or artist really).
The boss came into the design in later stages of the draft, the concept was that the player would fill the emptyness the more they progressed with a 3 round formula. The boss fight Idea was just too cool to pass up so I had to design and implement it on the last sprint