i played through it a bunch, and despite that my average run time is still about 3 rooms. while i'm sure you're aware of difficulty complaints, i'm going to focus on another aspect that i think wasn't covered enough.
the idea of the game (from what i can tell, anyway) is that it's a fast paced reactionary shooter/combat game, with the idea being that you see an enemy of type X that is vulnerable to Y damage, so you change your "loadout" to deal Y damage to dispatch that. i tried to play the game that way - but i feel like the design and capabilities of the player's kit goes against this idea. it simply feels too slow to play this way, and it feels better to just pick random elements and start blasting. i think this can be easily improved by speeding up the player side of things. for example, add a quickswitch button for the weapons (maybe to the mousewheel, like in shooter games?). then, try and make the alchemy part quicker. if you already have the fluids at the bottom of the screen, how about mapping keys to add an element? so instead of opening the menu, i'd press 333-444 and have a combination of 2 elements and i'll be ready to shoot in under a second, and i'd also be able to see this change since the fluids are showing at the bottom.
something else that needs addressing is the enemy targetting range. if an enemy has sight of me from across the room where i can't see them, then i can't prepare for it. i think this is too much for the first 1-2 rooms where the player is still learning, so i'd see about lowering their detect radius until the player is at least familiar with the game. they could also use better death animations, since i often times slapped a dead enemy i thought was still alive.
lastly, i think the first few rooms should have mandatory indestructible cover. give the player a chance to figure out enemy attack patterns safely without having to worry about dodging things. it can be as simple as a 1x1 pillar by the first door or in the middle of the room, giving the player a bit of breathing room. i guarantee new players will be faced with the shot-cooldown thing if they misuse their elements, so this gives them a bit of time to readjust. in later rooms just get rid of this cover and keep it as is.
otherwise the player model is nice and the UI is very polished and detailed. the dungeon generation works too (hallways maybe a bit too long), and things like the minimap highlighting rooms are a nice touch. i'd just make destroying objects faster for the player (but keep it the same for the enemies) since it's a bit weird to need to hit a box a bunch of times to break it in the starting room with no enemies around.
keep up the good work