So, TIC supports two gamepads each with 6 buttons:
0-up 1-down 2-left 3-right 4-a 5-b first gamepad
8-up 9-down 10-left 11-right 12-a 13-b second gamepad
BTN(id) function returns true if button is pressed in current frame, BTNP(id) if pressed in current and wasn't pressed in previous frame.
Default keyboard mapping for player #1:ARROWS [a]-Z [b]-X (or <,>)
for player#2: RFDG [a]-A [b]-S
But there will be a configuration tool to remap keyboard buttons.
Thanks for the words of appreciation :)