That's actually depends on device you use to play it, if it's android, then yes, 400MB is a lot of space, and if it's computer then in 2021 it sounds silly with how 100G+ games became a norm nowadays.
AAAAnd for the fact, since it looks like you didn't get it, I loled not about WHAT you wrote(the issue is legit, and ways to solve it are usufull be it for developer or not), but on HOW you wrote about it. It's one thing if you were his patron and wrote that, but since you are not, the whole part about how you are forced to delete the game from your "must download folder" because of this issue is funny as hell, you could have just skipped that part and wrote about the problem derectly.