You're right, it's the remake of <span class="bold">Wizball</span>, one of my favorite games on the C64.  If you want to download the remake, here's the link :

 ▪  <span class="bold">Wizball remake</span>   ( Gameplay video )
 
 
Here it is !  :-)

Okay, this may be too obscure so I will give some clues:-
It was released on the Sinclair ZX Spectrum 48K
It was released on the Mastertronic label.
There is a big oblique clue in the file name.

*no clue bump*

Dirty Harry?

You are 1/2 correct!

Halloween Harry?

Sorry, this is an old game lost in the mists of time.

To solve the name of the game, combine the partial titles of two Clint Eastwood films together.
Or look for the list of games released for the Sinclair Spectrum by Mastertronic.

From this clue, I figured it out easily just by googling "ZX Spectrum Harry", but I'm not sure if it's fair I say what it is since I'm the Puzzlemaster, and that's sort of semi-cheating for me.

Dear Puzzlemaster. As you are the master of puzzles, maybe you could give a better clue than my muddled brain can.

Clue? Last time it was my turn at the non-screenshot version of this game, I wrote entire poems.
I would try to help you here, but the more I think about it, the more I realize that this game is so obscure, I don't believe it's possible to solve it at all without googling the answer, so I'll just take it:
It's Alcatraz Harry.

The Puzzlemaster reigns supreme.

I do what I can.
Huzzah! Huzzah!

Now, since my "easy" one was a headscratcher, let's try something "obscure".

^_^ Treasure Mountain. I remember playing that a lot.

And it is as I predicted. I make the "easy" one, and nobody gets it. I make the "obscure" one, and he nails it as soon as he sees it.
Yup, that's right! I loved playing that game as a kid.
Your turn.

Here's another obscure one...