2023 was truly the year of Haute42, a company that has produced so many slim and affordable leverless controllers, and other companies performed well too.
Certain Deth is a Detroit-based outfit that provides custom enclosures and builds with key, button, or joystick directional inputs.
The Neobox is an enlargement of the open source Flatbox. It also spares you from building a Flatbox yourself.
The Slab Mini All Button Controller is a sandwich acrylic case controller with hot swappable sockets and LED.
After one takes a look at the Sunga G5, the Victrix inspiration becomes immediately clear, and it is up to you to decide which one to buy.
The Superslab Digital Combat Controller is a smaller LED controller by Prong for Super Smash Bros players.
The Stress Pocket Arcade Fight Pad is a mini WASD controller with unusual angles that may appeal to you more than the usual layout.
The RTU-A4 is a fantastic variant of the RTU for those who would like more wrist resting space, lap play comfort, and so on.
The RTU is a slim 1" mini leverless controller with Cherry MX or Glorious Pandas switches that you can customize the button colors of.