If you remember the arcade game Punch-Out, or the 8-bit clone Frank Bruno's Boxing, then you'll be instantly familiar with this Tynesoft thumperama. It's a fairly standard boxing game, in which your character is transparent, enabling you to see the other boxer and hopefully clobber him senseless.
It's a game that's immediately limited by its choice of subject material, but it's not too badly done at all for what it is. The main drawback is that it turns into something of a guessing game quite quickly, and hence little skill is involved. Still, reasonable mindless violence at the price.