Wow, what a lovely comment! Doom was definitely one of our inspirations, but Cuphead? That's a comparison we didn't expect at all, haha! Such a huge compliment!
And yes, those are our own voices! We had a lot of fun making all those ridiculous sounds with our mouths, so seeing people enjoy them is absolutely hilarious!
This was actually my very first game jam! My teammate had more experience than me, so I learned a ton throughout the whole process. It's really cool to hear that someone could learn something from our game too, especially from a game design perspective!
Seriously, thank you for taking the time to write such a thoughtful comment!