So simple but so addicting! The sprite work and animation has a lot of charm and it was a fun idea to characterise those gubus in the description. Makes me think of Pacman ghosts, would quite like to see those kind of quick animations between levels showing their antics to squeeze out that bit more entertainment! This was a really cool interpretation of the theme, didn't expect testing my ability to size up groups to get me to keep coming back for more.
I think the only thing that gets in the way of initially onboarding someone to this game is how the goal and your abilities are communicated. I didn't have trouble with the sizing goal but it might help to contextualise why we're only rounding up a specific number (e.g. only x number of parents have called to drag their kids in), and it took me a while before I figured out that you can click on the bugus to get rid of them. Think that last one was because I confused the words gubus and bugus in the description, just need to add the sprite to fix that I reckon.
Also a quick word about performance: the game only struggles once the gubus are ascending away, if you were to divide them into groups and update them in separate frames that should hopefully keep it running smoothly.
Overall I must have liked it cos I kept at it until I got that A rank!