The file hoster you currently use has malicious advertisements. The bad kind with misleading texts and popups opening by clicking on unlreated areas, redirects and so on.
You do not see, if a file was actually downloaded. You only see that people clicked the link. Same for aborted downloads on Itch. You do not see, if a download was finished.
The game looks 2d images. I hope you use lossy webp. If you use a lossless image format, your game could be shrinked down to 20% or less without visible quality loss. If you use butler to upload to Itch, your file size limit is also increased.