Mecha, or mech games prominently feature mecha under the control of the player.
Mecha themed games organised by genre. It may also be valuable to organise them by mecha type, and perhaps others.
'2-D' here refers to the way the gameplay works, rather than the way graphics are rendered.
For games like the Virtual On series
These are typically more 'sim-like' than other genres–'sim-like' meaning a beliveable sense of weight ,and non-simplified controls.
Often more action oriented than those with a first-person perspective, though there is overlap.
In this genre the featuring of mecha is predominantly a visual device only.