Probably one of the best games here, what can I say its Derpi.
The art is amazing and fits the style, the use of the limitation was creative I liked it, the sounds feel good and fit this arcade style.
The mechanics are polished, they feel good, the enemies are fun and hard, and they have different attack patterns wich make them better.
One thing I would add its maybe a death animation of the monsters instead of just the blackscreen, but that's asking to much from one person in 7 days, overall 5 stars, amazing game