Hey Chris!
Thank you for playing we're glad you tried to get the True ending and that's unfortunate that it registered you to take the keep power instead :( I guess the shopkeeper really didn't want you to get you the true ending haha!
Yes for this version the attacks I get that it knocks enemies further away so you choose to attack once and wait for the animation reset, We actually have an updated version where the player can move while attack which makes the combo more useful! but for this current version what i like to do is stand around the enemies and attack on different directions so i get the other enemies too!
We appreciate your time playing the game and glad you enjoyed it! :D