i really don't wanna be overly mean or critical since this is your first jam i saw, but i feel that criticism is best for anyone. especially newer developers (also hi fellow first jammer :) )
i'll start with my praise, i really do like the art style! you did amazing with your art and i think that shows well, it's probably some of the best pixel art i have seen sofar in this game jam! the music and sound effects are very nice, i really like them and i think they add to the gameplay a lot. the game mechanic of 2 buffs vs 2 debuffs was very good, i think the choice is a very good decision to put in the hands of the player and i think it's good to have a debuff in contrary to a buff to balance the player so they aren't just incredibly overpowered. i also liked the menu because it told me exactly the controls, in the future it may be better to implement that with a tutorial but i get why you didn't. tutorials can be hard.
i think one issue i had was that a lot of the enemies just fall from the sky rather than being preloaded into the stage, it disrupted the natural flow to me. such as when one enemy just spawned at the start of the game, it threw me off as a player and made me feel i lost control. this happened a few times and i think that it felt a bit un natural.
the background could've had a bit more to it, it being pure black kind of threw off the vibe a little.
the game felt more like a shoot out than a 2d action platformer as the actual platforming was a bit minimal. i think this may have been a time issue with the game jam though. i had a similar issue with my game in which i had a very different concept originally but it turned out to be something else just because i couldn't find the time to learn how to code certain aspects of my vision. it's an experience that happens to many developers.
the enemies were quite hard to dodge in my opinion, the aim didn't work and that's not your fault. it could've just been a weird thing with exporting to web. other than that though it just was quite hard to fight the enemies and dodge them.
i could infinitely jump which was a bit of an issue as it was also meant to be a platformer. i don't know what engine you used so i can't tell you exactly how to fix that, i only know how to for godot though.
the movement was a bit slow and it wasn't clear i could sprint so it just felt slow.
overall, i don't mean to bash you. this is your first game jam and with that being said it 's quite good for it! mistakes are made so we can learn by them! i believe you have potential especially if this is your first game jam. i wish you good luck in your journey as a developer!