Hey! Great game! The use of tilesets and perfectly rendered character animations definitely set this game apart. The music is an insanely good bop that really sells the vibe you're going for here. The level design is genuinely inspired with the limited number of tools you have featured here, and they look nice. Really cool boss sprite. I can tell y'all put your whole heart into this.
For critical feedback, I have some notes. A game that doesn't tell you it's controls should respond to anyone's first intuition, so mapping your attack to a left mouse click, or more keyboard buttons like z, x or shift would help, similarly I didn't know you could double jump my first few tries, so I got stuck. For the start of the game it feels like the dominant strategy is to avoid interacting with the enemies and beeline for the exit.
The player controller when positioning the player doesn't has a constant horizontal velocity that can feel right in some games, but feels off here. The character will be more fun if you let the player fake physics in the air a bit more to gain additional control (e.g. like in Rogue Knight) Finally, the sword could achieve more weightyness with a small knockback effect. This would make approaching enemies a bit less fiddly as well I think. Overall, such a good effort.
Also curiously the volume buttons on my keyboard move the player left! Makes me think of using that in a novelty game at some point intentionally XD