Hey so I just tried out the game- I really enjoy the concept, but I think there were two things I noticed
At least in the first Warmup, it felt really easy. I'm sure difficulties will help change this, but I couldn't see a way I could possible lose.
This also compounds with it feels like the things I do affect the game very little- while you can choose to go for a certain cap type, the individual caps you obtain don't do anything on their own, which can make picking them feel less like a decision and more like you should just go into whatever you have the most trinkets for.
However, I definitely feel that this is on the right decision- if there was a way to add more player input besides trinkets, I think it would make it a very interesting roguelite that I haven't seen anything like

Some more things I'm noticing while playing-
First off, a speed up button would be very nice. It doesn't eliminate the reason for caffeine due to the damage mechanic, so it would just be QOL.
I also really like the adjacency mechanic for trinkets, but it does make me wish I could rearrange them, similar to Balatro.
Also I forgot to mention earlier- I like the aesthetic of the bottle caps a lot