The Size is the white bar, which is not properly communicated at all, so I'm not surprised it's hard to tell.
If you got that result, it was either because the Size was at 0, or a bug. Sorry!
The Stat system was supposed to be a bit more complex and the main mechanic of the game, but I ran out of time sadly and it's unfinished.
I'm glad you liked the concept, I'm happy I was able to imagine something semi creative (something I struggle with most of the times), even if I couldn't actually finish it. Thanks for checking the game!