Help with retention

Hi, im trying to improve my session time on my game. If you want to help the link is:

So its pretty obvious my game is “inspired” by sols rng, and i understand this game probably wont be fun for a lot of you but thats besides the point, im just trying to re-create the success of sols rng. Also feedback on thumbnail (to improve my clicks) is also welcome.

Thnaks for any help (sorry if the link is wrong)