First of all, love this game a lot. Respect for making this game at all, let alone free of charge.
I do have a few suggestions for how certain things might work. For example, I'd personally like to see gas pills stack in effectiveness like the digestion pills do. I realise it might be a bug, but it seems the pulls seem to produce gas based on time more than amount. Second of all, more status effects for example if you're near or over your limit it causes lots of discomfort that might make certain things difficult, or having a heavy stomach from water etc means you can't swim. Other things I would like to see if they are personal include more methods to 'save yourself' from bursting (like a bath or something, it could increase the amount of gas you can expel if you've abused the pills), a way to increase the maximum 4000cc limit (even if it's risky and only possible up to a point) and some variety in characters (maybe an overweight one has more natural capacity, or one has an extra intestinal loop etc). That's all I can think of though, so absolutely fantastic game.