Feedback on my merging game (again)

Hello everyone! I’ve posted a few times for feedback on my game and received some amazing feedback. Since then, my retention rates have gone from 2-3 minutes to 13-14 minutes, almost 7x what it used to be! I’m incredibly glad some people enjoy my small game, but I was hoping to get feedback on things like the thumbnails and gameplay because I want people to click on the game and potentially play it.
Link: bricklabs - Roblox
Thank you so much if you can give feedback!