I was thinking it would be similar to tetris, I like the idea of building blocks. I was trying to setup on covering all square blocks to check if I can win the game. One issue that I've encountered when the long blocks was hit by the square box it fell and the goal of completely filling up all square boxes was now impossible for me because the blocks collided and has dropped. I like that there was a space bar to make it faster to fall at first I thought I just need to wait and the camera movement too was working well. At first because I didn't read the controls I was trying to fill out all the square boxes without rotating the camera. Here is the screenshot I was able to have 49 blocks spawned. Overall nice job. 
Thank you so much for taking the time to play, screenshot and give feedback to my game.
I really like your idea, I wish I had thought of that. I could make better-designed blocks with lights on them like the long bock, and they could flash when you get a 3D tetris.
This is a jam game and I have run out of time and energy. So I have cobbled together a speed tower-building game. But I defiantly want to start again and follow your idea since I have already done all the hard programming work.