Buster

Buster is a Japanese doujin platform game that’s clearly been heavily influenced by Arcade platformers of the late 1980s, like Wardner and Legend of Hero Tonma. In it, the player travels, in the traditional manner, from left to right, killing enemies as you go. One standout feature is the sword meter, which decreases every time you make a normal attack, and replenishes gradually when you’re not attacking. You do also have an alternate attack, in the form of a sliding kick, performed by pressing the attack button at the same time as hitting the ground after a jump or fall. The sliding kick doesn’t deplete the sword meter, and in fact quickly replenishes a large portion of it.