@Marcin7j I just ran a dagger build and didn't have a problem killing fliers. If you get your back to a door or unspawnable area and just hold down the attack button, the fliers just run into your hits. I bought the orichalcon edge. It hits fast enough and has a good enough hit area to take out anything.
@Tim5o Usually the better weapon you have the better the area of damage. I had trouble with flying until I upgraded my weapon. I'd smack a door a few times then turn to face the spawning enemies. It makes it so the fliers can't get behind you and had to fly lower to hit you. I used a staff so I'd just blast away and let them run into their own death.
@Igor83185 It's possible to kill him without having maxed out your skill tree but doing so helps a lot. Max out your weapon damage followed by your health, defense, evade, regen, and lastly your special spell damage. I then busted open the bosses door, ran all the way back to the beginning and killed anything that spawned in front of me. It helps to corner yourself. When the boss hits you once, he'll spawn back at the beginning and start walking toward you. This helps grind for lots of xp and souls so you can max everything. When his health is down between 50%-25% he'll teleport on you. You have to run the opposite direction from where he appears. If he hits you, he'll repeat the teleporting and hitting. If he misses the first hit and stays within your line of sight, he should start walking again and you can smack him. Lots of jumping and using special magic. TLDR; grind and take the hits, then dodge like a mad man hitting him when you can.
Field D1 is not in a normal location. Go to Field D (says it in the bottom right of your screen) and click the arrow on the bottom center of the screen pointing to the upper right.
This might be because the game loads through an iFrame, and the hosting site might have trouble getting too many connexions at once. Try reloading the page.
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 "2D Minecraft"){kind=icon}
 "Retrieve The Money"){kind=icon}
 "Platforms and Coins"){kind=icon}
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 "'Til Cows Tear Us Apart"){kind=icon}
And the good news is... We've done the "resetting skill point" part :)