I think this was made as a Flash game first, not sure where I found it though. This 4k remake is a good idea!
If you have some bytes left I would suggest to improve the “feeling of satisfaction” when making balls explode. I think most of this game’s interest lie on this stupid “click and watch” thing, it’s a bit like when playing with bubble wrap =D At least the first levels should be really easy (and by easy, I mean hundreds of bubbles :P), it would also help people unterstand the rules - or at least having fun clicking everywhere.
I guess you could improve the feeling of the game with nicer balls (by giving them a more 3D’y look?), more spectacular explosions (more particles? shock waves?), and why not sound improvements, like a “blowing balloon” sound when balls grow - not sure if it’s easily done with procedural sound though ^^