Found a beat-em-up on Steam, made by Burger Kurger.
You play as an organism engineered by an A.I., sent to Earth to destroy humanity. Similar to Katamari, you start off small but each item that you destroy adds to your mass, allowing you to destroy larger items. Various things will try to kill you, and upon each death you’ll be awarded currency to unlock different perks that will make you stronger in your next run (hence the roguelite tag. Or roguelike, I can never tell the difference).
This mainly focuses on giantess, BE and AE, with mild amounts of weight gain (albeit not a large feature).
There’s no nudity but it’s still age restricted so you’ll need to sign in to Steam to view it.
There’s also Burger Kuger’s website that has links to all their games, animations, patreon, socials etc., should you wish to check that out.
It’s made by Burger Kurger. I’ve seen some of their animations (which are very good) and they definitely do weight gain stuff alongside ass expansion, breast expansion, and giantess stuff. I didn’t realize they were working on a game though since I don’t follow them too closely.
I had to double check, Burger Kurger has made specifically weight gain games before that have been shared around this website. Here’s their itch page, but they did the frog wife game and other small good ones.
I just checked their twitter page too and there are the same teasers as on steam, but burger also retweeted some fan art of the mc of the new game with a chubby physique/blatant belly
In the training room, right after the red aura room, the door will start closing upward, but if you double back and enter it before it closes all the way…It will lead you, to the final outfit.
I got the game on Steam after finding this post and I can wholeheartedly say it was AWESOME! Thank you so much for bringing this to my attention! Visca is so cute and I love watching her get bigger! And yeah, while weight gain isn’t the major focus, I do like seeing her develop a slight bit of pudge when she gets more giant, hehe. x3 I can’t thank Burger Kurger enough for their work!
I am guessing you are in a country with its own game rating system, so a lot of them forbid adult games to be shown. just look up countries where ESRB is used.
I somehow went 6 months without realising this was also on itch. There’s a link in the top post now for those who don’t want to get these sort of games on Steam.