Well done, especially for the time frame! Lots of fun, great humor, nice, consistent visual style. Brought me back to my childhood a bit (cynthia, indian burns, pogs).
I also liked the sphynxter, thought that was pretty funny.
The art itself was really great (the sphynxter appearing was awesome, so was brioche's attack). However, some of the pixels seemed to jitter. Did you guys play around with tweaking Unity for pixel perfection? I know I've experienced a bit of difficulty myself with this in the past.
Also, I'm curious, were the battles done completely using the canvas (or UI elements in world space)? I ask because of the masking effect when defeating enemies and when the health bar (haha, I'm just realizing the brilliance of having the health bar be an actual bar :D) reduces.
Anyhow, great job. Keep it up!