Looking at the specs from your link,
CPU: AMD 8085
GPU: Plessey MR9735-02 (Viewdata processor)
with 1K page memory RAM
Modem: Philips SAA5070 "LUCY"
Monitor: 5" integrated
that's plenty to run games.
Still, I doubt that games did exist, because
they built 10,000 but only sold 5000
so the volume was too low, and if they didn't have documentation about the system like for other homecomputers at that time, nobody would sit down and write some.
On the other hand, it had Prestel access, and Prestel offered on-line games.
So maybe that counts.
since it would be interesting to see it's graphics capabilities
I can give you some more information about the graphics capabilities. The 9735 is a typical chip used for the Videotex variants (of which the UK Prestel system is one). The datasheet can be found here. Summary:
24 row x 40 character
96 alphanumeric characters
64 graphics shapes, contigous or separated
7 colors + black
double height characters
special graphics (one bit for each 6 dots in line of char)
6x18 for each char
half page operation
cursor in 8th bit of page store
So any game would use the alphanumeric characters and the graphics shapes. While one can display arbitrary graphics, 1K RAM is not enough to make use of that for larger parts of the display.
Which means games would have a blocky style, but animations (in the sense of "moving" characters) should still be possible. It's not clear how quickly the 1K page memory RAM can be accessed from the main CPU, so there may be restrictions on how fast the screen can be updated.