This is directly for the dev:
Change your format. You are using .Gifs That which are like 15mb each. Your game is 2GB but gameplay wise there is no content that would explain 2GB. Convert your gifs to Webm. I don't know if you want your game to look big by leaving your size inflated, or if you just don't know how to convert them.
In any case, I recommend using:
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It's a free Cloud file converting website. I use it myself to convert my .mp4 Animation's to Webm. You will save at least 70% - 80% of size. In regards to giv, what you can do, is either convert it to a mp4 and then to webm, or have webp animated images. That's up to you and your own preference. Also you can fool the free limit by using any free VPN.
For your png's, convert them all to webp! Use
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. It's a completely free and open source batch converting software for images. It's easy to use and you can convert all your PNG's at once to Webp's.
Then changing the formats in your code shouldn't be much work, there isn't much scene wise anyway.
And in regards to content. My tip, as a dev myself, give yourself more time and get it to a point where you have multiple branches. They don't even have to be ready, but have more content available. People are starting to get sick of Playable tech demos with only 5 minutes of content. You are losing possible supporters, by forcing them lass content and this bug file size down their throat.
Food for thought.

You can do with it, what ever you want. Good luck and wish you the best.