Pretty neat concept,
i like the idea of the drill gun that you have to charge, and i also like the boss behaviour in that it changes pattern depending where you try and go around it.
The spritework here is also really good, and i like the chibi portrait of the potato girl next to the lifebar that reacts real time when you get hit thats a neat detail.
To me the only real negative is that the boss takes so little damage from the drill gun, so it's really quite an endurance round to try and take it down, and i got real close but just couldn't :(
Other than that i had fun trying this one out, good job to you :)