this is … an interesting concept, if I can say so. For me it looks like a Reverse Tower Defence type of game, where you are a tower… Sword, in our case.
“Great” learning curve. I learned that you could swipe at enemies only after I purchased all the upgrades…And after half an hour, the music started to grate my ears a little, but I am very casual player, so most games take me much more time to complete.