Imagine if the game looked as good as the thumbnail. Just. Imagine.
I think limiting yourself to only purple and black would have helped a ton in consistency. Or at least limit white to only collectables/UI elements and text. Right now it looks like the aside from the enemies (which are cool) and player, the rest just feels like a prototype. The reason why I bring this up, is that there could be so much more potential with this.
Your take on the theme, while wasn't apparent to me at first, is a great one! I'm surprised you got a whole rougelike system up and running here!
The music doesn't reeeaally fit in imo. I wouldn't necessarily call 8 bit SFX a cool feature, imo they really sound samey over all the gamejams going on and the only sound that fit well was the shooting sound.
I don't know why, but your player looks much more poorly designed compared to the enemies. They're all soft and don't really have any hard edges, while the player does.
Speaking of the enemies, they would need some rebalancing. The turret looks like a better player. When I shoot it spins (which made me confused at first, that usually isn't what makes me think I dealt damage) and starts shooting in a random location. This means I'm able to stand in one spot and shoot it until it dies. Also, for some reason it's bullets destroy mine, which can make for unintuitive and unavoidable damage taking moments. The big eyed enemy is too fast and forces me into corners. The triangles are perfectly simple and squishy, but realizing they are actually enemies took me some time, as they stand around a lot and dash slowly.
I've had a favorite moment when I encountered a room empty aside from about 20 triangles. That was a nice change of pace.
The UI looks so out of place. You could have also added a prompt saying you can press space to open the map. The rest isn't necessary, especially if you're low on time, because a lot of games use WASD + Mouse controls and it's fairly intuitive. I also don't know why I am apparently collecting coins. That just feels kinda generic and unnecessary. I used the word necessary at least like, 4 times in this review, lol.
To be honest, this game feels unfinished and a little unorganized. You've got a great system and idea though, so I won't be rating this too low. Imma try to be fair. Just next time when you enter a gamejam, focus more on:
+ Consistency and Coherence
+ Polish
+ Finished product
You've got skill and if you focus more on these, imo you can make some great stuff. You can even consider expanding this game. You would probably need something to make it more original, but you could make this bigger. I'm just saying to consider it.
Also, I am now realizing this is the longest comment I've written in this gamejam and it's an absolute wall of text. Oh well.
Have a good time makin' games :)