Menus do not support controllers. Please use a mouse.
Click Mission or Arena at the top, select one, then click READY to deploy. The selected one will have an E mark.
For mech customization, click Assemble at the top.
thanks!
If you're using a DualShock controller, please go to Options > GamePad Select and select your controller there.
If it still doesn't work after selecting it, I'll look into the issue.
The Shop is still a WIP. You shouldn't be able to click it yet — that's a bug.
English localization is planned, probably after the beta.
thanks!