I agree with Yanisin. If you expand on your ideas, this might turn out to be pretty good. Try the new one even if this doesn't get good reviews, and see how it turns out.

Was I vsing an AI? This game was boring, that's my opinion. I'll now expand.

Firstly, it had no music to immerse me in wanting to play, fast paced music would really benefit this game, (Add a mute button, it's my pet peeve when people don't) Maybe some sound effects (plural) for cutting the cubes would do it some good.

A click and drag slasher would be nicer, just for those who are quick, and to make cutting the squares fun, it's called cube "smash" but it seems more like a cut em up. So either make it a cutter, or maybe it'd be cool if you made the pointer a fist, and when you click it smashes them it'd be better deserving of the name "cubesmash"

The art is a bit amateurish, and is very repetitive (the cubes death), which is why a click and drag game would be cooler, though I'm not sure how difficult it is to make games like that.

Also, if possible, make either a variety of difficult AI, or make it so you vs random people online.

Overall, bout a 2-3

Well, can't say it doesn't do what it says, you do smash cubes by right-clicking on them as they appear. Don't really understand the point in it though. Unless you have friends who are willing to play this with you and compare scores, there is no way to win or lose. It's like whack-a-mole for your mouse. Definitely needs more work.