I love the idea behind the controls! It's very creative and a good take on the theme. I did feel like either the collision detection didn't feel quite accurate or the sword wasn't going exactly where I was aiming, so it felt a tad random at times, however, with that said I managed to get to wave 29 and loved the enemy variety and presentation!
Tiny bit of juice and I could see this being addictive as hell too.
Fantastic work :D