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This game is pretty amazing and it certainly reminds me of Helltaker. I wonder if it was the inspiration behind it, given that it was released way back before it? But even though it's just one boss battle, it still feels somewhat more involved and entertaining, the hard mode challenge that I set for myself took me a good three hours to accomplish...
Game is by @aylanonsense, and, is free to play. If you are looking for some good challenge, I would definitely suggest it!