You completely nailed the right feeling for the attacks, both for the player and the enemies: the screenshake, the particles and the sound effects make them really satisfying to land and terrible to recieve. I also really appreciated the limited-colors palette and the overall difficulty of the game.
The only complain would be on the menu, but I know that when you have to make a game in such a short amount of time the ui is the last thing you would like to do. Excellent job!