Hey! I enjoyed the movement and pacing of your game. It felt nice and quick to get around. It might be cool to explore attacking while moving as an option to keep the game feeling fluid.
The art is a lot of fun. I liked seeing the different designs in the menus and the extra concept art. The level colour scheme is unique and consistent, though I feel greater colour variation in spikes and boxes could help them stand out as things to avoid or interact with.
Additionally, SFX for swinging your weapon as well as breaking crates would make a big difference with immersion, imo.
I found a bug when I died to the first enemy and respawned. It was like I was stuck in the air and couldn't walk off the respawn platform. I tried using the menu to force another respawn, but was still stuck. I only tried this once, so it might not be replicable.
I hope this feedback is helpful. Keep going!