I really like the style of Kristian, I really get a kick out of this series of jam games!
It's clear that ya'll didn't get as far as you wanted to so the only piece of feedback I'll leave is that this game is really tough! For jam games you typically want to aim for the easy side, so I'd make it so Kristian can take 3 or 4 hits before dying. I'd love to see more waves!