Here's what I have implemented!
Dash
Timer setup (on the right side of the health gauge)
Automatic attacks
Boss enemies drop a forced 1up
Display of operation method in text
Main character movement animation
Enemies slow down as they get closer to the player
Persistent power-up elements
Increases in magic power (power), speed, and health
Upgrade enhancements
Increase in types (auto recovery, sacrificing speed for a significant increase in power)
Increase in attack power
Unlockable elements
Sword magic
Line magic