Hello everyone. I know I've been late to the party, but I would like first of all to say this game rocks. It is really good and compares favorably even with the best of 90s arcade games on this genre. I'm creating this thread to gather the list of tested and working controllers. I'm mostly playing on GoG and also perform these tests for the executable available on another platform but I guess (and hope) the executable is the same as the GoG release. All controllers in my list are tested against the GoG and another PC platform. I will add in the following posts even more tested controllers. I hope we can get a patch in order to be able to support even more USB gamepads, arcade sticks in the future. Here's my current list:

[Working]
8BitDo SNES30 Gamepad (Model SNES30)
Microsoft Xbox One official gamepad (Model 1697-IL)
Microsoft Xbox One X official gamepad (Model 1708)
Microsoft Xbox 360 official gamepad Wired (Model X803238-007)
Sony Playstation 4 official gamepad (Model CUH-ZCT2E)
Nintendo Switch Official Pro controller (Model HAL-013) (not responding in Windows 10 game controllers diagnostic but works in game!)
Hori Real Arcade Pro 4 PC mode (Model PS4-015)
Hori Real Arcade Pro 4 Playstation 3 mode (Model PS4-015)
Hori Real Arcade Pro 4 Playstation 4 mode (Model PS4-015)

[Not working]
SEGA Mega Drive Mini USB 3 button gamepad (Model MK - 18520)
Sony Playstation 3 Dualshock 3 official gamepad (Model CECHZC2E)

DISCLAIMER: All the tested controllers above are perfectly working under Windows 10 and show up in the game controllers testing tool.

**UPDATE**

[Working]
HORI REal Arcade Pro VX Ultimate MvsC 3 for Xbox 360 (Model HX3-75U)
Madcatz Street Fighter IV Arxade Fightstick Tournament Edition (Model )

[Not working]
HORI Fighting Stick 3 for Playstation 3 (Model HP3-01)
Any Dreamcast, Playstation 1/2, SEGA Saturn controller via 3 in 1 PC Joybox USB converter

I have 8bitdo arcade stick, it works fine on this game

Just for your records, I've used a Mad Catz TE2+ and a Hit Box without any issues.

Is Hit Box like using a keyboard?

Similar when you have up mapped to space bar. Up is bottom directional button on hitbox, so you generally use your thumb to operate it. Takes some time to get used to, but I think it is more comfortable than the WASD layout imo.

Thanks for the reply. I heard it's faster in theory, but I don't think I can part with my joystick.