For the simple fact that this game is less then $1.00 Canadian makes it 100% worth buying.
But of course then there's the actual Game itself which IMO....10/10!
It's a great game and I may only be 19 but I still get those feels of playing games like Asteroids or Space Invaders
when I play Bit Blaster XL!

Played this on AG and loved it because even though its a clicker/idle game you still get to do something, even if it is just shooting cubes!
For now I'm giving it an 8.5/10 if Proton Studios adds some more tunes THAT YOU DONT HAVE TO BUY...then I'd give this game a 10/10