Interesting game, if a bit shallow. Here's my three pieces of constructive criticism:
1. enemies restoring health when killed isn't a bad mechanic, but the fact that the druid necromancer spawned monsters made him pathetically easy, because any time I got low on health I just backed off, waited for him to spawn stuff, and killed it for easy health. So yeah, take that into consideration.
2. The Dark Souls sounds are probably placeholders, but the don't fit with the graphics so something a bit more fitting might be warranted.
3. Lefty was just annoying. The entire fight was hold your shield out, wait for him to spin attack, beat his ass when the spin attack is over or when he tries to heal, repeat ad nausium. Probably want to add something to that.
Oh, and I didn't find the secret boss. Any hints on where he is?