This looks incredibly polished. The look & feel is great as is the music. The controls feel good and natural, respawn on dying feels fair.
However, this could just be me, but something does make this game hard on my eyes. I think it's the speed, it's really quite high. To compare I looked at Hollow Knight, which has a good pacing to me, but looks almost sluggish compared to the speed in this game. I'd probably want to see it lowered a bit. Alternatively, zoom the camera out further.
Wall jumping can be cheesed a little by just spamming jump into the wall; maybe a short cooldown on jumping would prevent that, if that's a problem to you.
The part where you have to drop down and avoid spikes feels a little unfair, because I can't see what's coming. I would either want to be able to move the camera down a bit to look ahead, or have the platform I'm dropping down to be in sight. It made it too trial & error. It bugged me that this made me want to give up, because the game was otherwise fun and feels polished. I admit that because of that I haven't seen enough of the game to give any further advice, but I could see this (or a sequel) be a good Metroidvania-like game too, with a world that isn't linear but can be explored in various directions, and upgradeable powers/items that could take you further down the dungeon.
Some small nitpicks: you should hide the mouse cursor in-game. I also didn't care for the timer, I would add it as a separate option, not something that's standard.