Game looks and controls very nicely. I feel like there is a fun game here but I don't understand how to play it.
One thing you could clarify (in the instructions here, maybe?) is what the colored bars mean. I see that combining boxes together makes the blue, green, and yellow bars fill up but I have no idea what they represent.
Also, maybe describe what makes us die of old age? It feels like I'm doing something wrong but I don't know what it is to try to avoid it. Maybe this ties in to the bars explanation?