itch.io

I can answer for pc

1. click the 'download now' button
2. wait 'till it's done downloading the file
3. go to files
4. go to 'downloads'
5. go to the zip folder of it
6. then click the gacha neon
7. extract it
8. then go back out to downloads
9. click the (unzipped ver.) gacha neon folder
10. then click gacha neon

and that should do it