I like how the blocks break cleanly into more shapes, I'm guessing you have the cube replaced with two models rendered based on
the position and angle they were struck at?
spotted a glitch? mainly from the blocks after they break, shrapnel can cause a following block to be knocked off course
and become unhittable, I also had a piece of shrapnel somehow launch me in the air.
the sound on the breaking of glass is a bit loud by default, even after turning my volume down a couple times, granted there's
no exact way to know what volume someone else's setup would be, I'd recommend putting some placeholder music at the start
to give the viewer an idea of whether they should turn the volume up/down.
angling is a little awkward in real time, and given the player doesn't need to move when making a strike as the blocks are
facing them, I'd suggest reducing the amount of input necessary to make angled cuts, perhaps if holding right click
made the user "free cut?" if you've ever played games like daggerfall, kingdom come deliverance, or bannerlord...
Its a good start mechanically though, kinda reminds me of fruit ninja.