Hollow Knight on Steam: http://store.steampowered.com/app/367520

Bosses in video:

[00:00] 1. Troupe Master Grimm
[04:52] 2. Nightmare King Grimm

Second free update, which adds a new quest and 2 boss battles.

The boss is intense, but he's not so bad. Zote and knight from the previous update were much harder. It looks like the Grimm was heavily inspired by Dracula from Castlevania series.

Also, don't forget, that the cost of the Quick Slash charm was increased, but I'm still using the old version of it. If you try my build in a new save, you will be overcharmed.