Hehe I remember having a demo of it ages ago and never finding the full game.
This one is probably way too easy for the old school people, its only part of a screenshot (the full screenshot would show the game title) but the font is very distinctive and I'll be surprised if it takes more than a few guesses to get it
Well, the obvious guess would be Dalek Attack, although I haven't been able to find a screenshot matching that one.
[EDIT] Tricky tricky... It's Paradroid :-)