I think having one hit is a little too punishing, especially with not having checkpoints and the character being more slower.
It made it very hard to play imo, so if you do make this beyond the gamejam, I would recommend adding more health or making the character faster to move.
It would also be nice if controls were listed on page, it took me a good minute to figure out what to do or that punching was even in this game
I do like the beginning cutscene, and I like the artwork done for the game though. and the environment design is really nice, especially with only a week.