This is a game that screams Ludum Dare all over it. From the quirky control scheme to the 8-bit aesthetic and music to the short (10 level) design. And yet, regardless of whether or not this was made in two days, it really feels like it was. The jumping mechanic is unreliable, and the controls are overall not that great.
Plenty of one button games already exist, and none of them have ever needed an attacking mechanic. In this game it doesn't feel like it enhances the game, rather it's a kind of gimmick. In some cases I noticed the sword actually extended the vulnerability hitbox and so attacking an enemy was causing me to die. The run/jump button was also weird. In some cases you could wait a second or two before starting the level to throw enemies out of sync, but other than that, having a button to run was pretty pointless. The jumping and bouncing was something I've seen in games before (Pix n Love Rush, for instance) and the "collect two, get to finish" goal for this game was not a particularly new or clever implementation of that idea.
Overall this game is beyond forgettable. Controls are meh and level design is meh.