Here is a game that I threw together in about a day’s worth of time. I think it’s a pretty good game, but tell me what you think. 
I think the game is too fast-paced. I had a hard time getting to 500 (but got to 2000 without cheating). I found it much more enjoyable once I went in and tweaked some parameters, increasing drop rates, and slowing down the boxes.
I meant for it to be that fast, so it would be challenging. But I’m glad I made it an editable file, so you could enjoy it.