Overall this is a pretty solid game. The pixel art and animations give the game a solid feel. Moving between characters is also a fun way to visually add upgrades to a character. I like that you got a basic menu working; it made navigating the game pretty simple.
Some thoughts:
- The music felt a little aimless to me. Maybe an overhaul there would be good.
- Seems strange to me that the sword guy can't attack in the air. It makes hitting certain enemies depending on their placement pretty challenging.
Good job!