What a very serious game! This is also a very unique mechanic regarding the roulette. If you intend on continuing development, I have some suggestions/comments for the game.
First, here is some context about what I did during my run:
I played on the normal build (not the untested one). I purely focused black, I alternated between getting black spaces, getting upgrades, and getting perks. I also always tried to bet 10 on black every turn.
What you did well:
The ability to control what spaces occupy your wheel is very clever, and has lots of potential to be built upon.
Your audio. The voice acting is very nice in my opinion, and the music is good and doesn't get stale during the playthrough.
The upgrade and perk system being a slot machine is very cool and perfectly combines luck and giving the player options.
What you could improve:
The UI is functional but it could use some small helpful changes. Things like having a visual health bar so I don't have to just read off of a number, being able to zoom in on my wheel in the upgrade room, and also transitions, so when the enemy attacks its not instantly the moment my turn ends. And also the ability to quit to main menu would be nice. Maybe there's a button for that but I tried to press esc and it didn't work.
The balancing feels a bit off, but that is more so just a product of the game being extremely luck dependent. For example, on the final wave I almost died to the 1st enemy, but when I went against the final boss I killed him in 2 hits, which is odd since I thought he had some sort of shield mechanic.
Overall I think is a great entry, it fits both themes extremely well and as a game has a lot of potential to be expanded upon. Good work!