I did enjoy this game overall, though I had some issues with it.
The button you have to hit sometimes gets hidden behind other objects, which makes it quite frustrating as you have to hit random keys till it finally disappears. The windows for you to be able to hit space, for me at least, could sometimes be less than half a second so that makes it kinda hard. I got stuck on day 5 in part because of it, the other being that I might not be the best player.
Shrinking down the play-area to a 4:3 equivalent frame would also be nice for me at least since I don't have the best peripheral vision and have to physically turn my head a bit to see what's going on on either side of the screen. Limiting where the objects can fall to a nearly square area in the middle of the screen would make it easier to keep in view.
Still, overall I think it's a fun idea that's pulled off pretty well and I really liked the look and sound of the game. Sorry if I came off rather negative, but I really did enjoy the game despite some of the issues I had!