Definitely a hard one but a great idea and solid execution nonetheless. I'm also in the "I can play my jam game really well but most people find it really hard" club so I get it. The character and enemy art is really charming, and that helped keep me from bouncing off the game when I faced the crushing difficulty. I only ended up making it to Wave 2 or 3 (I had 3 archers and one swordsman when I lost) but I did try a lot of times.
I've seen a few (but only a few) games that mixed FPS and RTS before but never with medieval style weapons, that was really cool and I hope to see more of it.