This is a pretty cool entry and interesting to see a 2D Unreal game. I like the aesthetic, a hellish dark souls.
Some thoughts:
- Character movement felt a little janky. The character moves a little too fast given the level design. I found myself running head first into zombies. I think if you want the character that fast, you may need to rework the levels to fit with that speed.
- I think you should add 'coyote time' to the platforming. Give the player a fraction of a second after they leave a platform to continue jumping.
- We beat the first boss, but from a cheese spot where the boss couldn't hit the character. Might want to investigate that.
Overall, good job!