I've just beat the game and I've noticed many of the users have been complaining about how the bosses are way too hard. I've just completed the game on medium so this is my boss walkthrough.
Act I: Wizard
The wizard is always shooting bolts at you, summoning gnomes and firing meteorites. He's quite simple theres actually no strategy to kill him at all. Simply just dodge the meteors, take the spells and slash him until hes dead.
Act II: Beast Rider
When the ground starts rumbling that means he is locked on to one row on the ground. I suggest moving as high or as low as you can then move the opposite direction to dodge him. Occasionally he will drop a spear. Swap weapons then when the beast rider returns press D to throw it and stun him. Then pickup your weapon and attack! Repeat till he is defeated.
Act III: Purple Goblin thing with dual knives
Took me the longest to figure out. Stick to one side of the plank and wait for the audience to throw fruit at you. Pickup the fruit then press D to throw it at him. He will begin eating which is your chance to attack. He will then jump then charge at you. The only way to dodge this is to do a sprint jump. (Right arrow right arrow spacebar) Repeat till he is finished. He is actually quite weak to blows so it shouldnt be long.
Act IV: The Gnome King I don't know if this will work on hard difficulty but it worked on medium. Let him hit you until your rage bar is filled. Attack until your rage is out, then run to the room to the right and open a crate for a heal item. Repeat till he is dead.
That is my boss guide to larry and the gnomes I hope this helps.
