The file size is indeed essential for Android users, so there is a compressed version available, size 432 MB.
It's true, the bad thing is that even in the full version some of the animations are not fluid, it's worse in the compressed version, how do I tell you, why do you want so much animation if some of them freeze? Just keep it in mind in future updates and don't waste resources putting a lot of animation in scenes that are not worth it, it will save yourself unnecessary work and you will not make your AVN only playable on powerful devices and not only for Android I have seen that some PC users also have trouble playing smoothly
If animations freeze, reducing the number of animations will not solve the issue. You'll just have fewer animations that still keep freezing. Unless you reduce compression or get a better phone, nothing will change.
Frankly, not every phone is suitable as a gaming device. If you decide to save money (or research) and get a potato, you'll have to expect and accept that some games just won't run smoothly. The same goes for PC, by the way: A netbook for example will struggle with most games and compressed video. Make sure to research benchmarks for your next phone, as there are relatively powerful and affordable devices for those who can find them.
The solution I'd suggest on the developer's side is an alternative low-res version with low compression for low-end devices - but that means you're not getting the high-quality animations those with decent phones and computers get.
However, before pestering for alternative versions, have you tried running the PC version under JoiPlay? With JoiPlay, you can play Ren'Py games regardless of size, because the app does not need to contain all the game files like a standalone APK does. PC versions usually have lower compression, which means smoother video playback.
Naturally, PC versions are big. Collecting games with over 10GB will quickly fill up most phones. So if you're running out of space, you can just get a nice terabite-sized external SSD that works with android to keep all your oversized PC versions and APKs. And movies. And Books. And everything.
My phone is decent enough to run any game and my PC too, It's a pretty rare game that I have that kind of problem with. But the suggestion I made was not only for me, but for the vast majority of AVN players, I've been doing this for many years and it's well known in the community that games that require so much storage are less played, as well as the fact that there is a large part of the community that plays exclusively on Android and that almost no one downloads a game larger than 3gb. Precisely for this reason, many Devs make their games in parts, as I mentioned before and if you don't believe me, just look for how many AVNs, no matter how ambitious they are, require more storage than what I said.
Also, the laggy animations not only happen to me, but to the vast majority of those who play... What good are high-quality animations if almost all your players can't enjoy them?
I think you are overestimating your demographic relevance. There are many players, particularly when it comes to AVNs, who do download the PC version and run it with JoiPlay, or just use their PC. I have a mid-range phone and run this without any issues, both the compressed and regular version. Also, if you really think 3GB is a lot, you're falling behind the times.
And no, your phone is not "decent enough to run any game" otherwise you'd not be here complaining. Most mobile games are made low-spec enough to run on any potato device, and that works because most aren't meant to be pretty in the first place, only addictive. Others are limited to literal slideshows with some animation where it is most important. Your phone has only been keeping up because everyone else has slowed down for you.
Again, your phone is not "decent enough to run any game", even if it's otherwise powerful. Most phones are optimized for communication and utility, and not made for gaming. Some have all their power in the CPU and neglect the GPU, while others are skimping on RAM, and yet others have abysmal I/O speeds on their storage. You have to do your research to get a phone that actually "runs any game", and you clearly didn't.
You're not a heroic defender of the "vast majority", you're that guy with a potato trying to downgrade the game for everyone because you couldn't be bothered to get a phone with an actual GPU. Do your research next time.
This sounds a lot like compression is the reason animations freeze in the first place.
A possible solution would be to make the APK at a lower resolution rather than compressing it too much, and recommend the PC version with JoiPlay. Which might need a bit of decompression too if PC users also have issues.
On the other hand, maybe this is just a few potato users getting potato performance. I'll download the compressed version too, and see how it runs.
Edit: Playing up to the "find me" scene so far, I've had zero issues running the compressed version on a Moto G100. Now, that's not a weak phone, but it's no high-end device either. I think it really is just potato devices performing poorly.