This was super cool! I loved the idea of making a roguelike, it's one of my favorite genres! Spending keys after you die for that edge, but at the same time losing points is tough decision, which is great. The idea of using doors that you can open with probabilities of rewards and losses is really well thought. It was a thrill to open them.
I like the art style as well. In my opinion is has an old game style of art and I really like it. amazing you could do all that!
I do think that adding some sort of dash would be great for the gameplay, as it would give you the option to dodge and maneuver a little bit more. Also the enemies were great, but a little more variation would have spiced things up. Maybe some tougher enemies that spawn in the higher waves. Maybe some are ranged for example!
It might not be a bug, but I did notice that slimes would sometimes hit me once and then kinda stick to me but without making more damage, like they only stay besides me.
Overall, really great experience!!!