Build me a 2d retro styled simple video game

The game should have a space theme, with a similar concept to Mario, the protagonist character will have swords, guns, etc to fight different bosses on different level, and the main goal of the game is to beat all of the monsters, and restore their home planet. Below I attached a file on what the characters should look like. The game doesn't need to look perfect, as it's a school project, and the due date is in 3 and a half weeks