PS Vita dev NorthFear has released a PS Vita port of X-COM (based on open source project Open X-COM).

If you're a homebrew developer, you have until May 27th to submit your entry!

Installation

Download openxcom.vpk and install it to your PS Vita.

Download openxcom-data.zip, extract it and copy OpenXcom folder into ux0:data/.

X-COM for PS Vita can be downloaded here.

Copy content of installed Enemy Unknown folder into ux0:data/OpenXcom/UFO or/and installed Terror From The Deep into ux0:data/OpenXcom/TFTD. You can check README.txt inside each folder for details.

Controls:

Left analog stick – Cursor movement
CROSS – Left mouse button
CIRCLE – Right mouse button
SQUARE – Open Map
TRIANGLE – Inventory
D-Pad Up/Down – Switch between floors
R1 – Select Previous Unit
L1 – Select Next Unit
SELECT – Esc
START – End turn

Buttons can be remapped in the "Controls" options menu.

Cursor movement speed can be changed by editing the "controllerPointerSpeed" option in ux0:data/OpenXcom/options.cfg.

Source

Source