Built a calm browser path puzzle around one simple rule. Is the first board clear on mobile?

I’m the developer behind Shaxing Games. I recently built LINEA, a calm browser path puzzle where you connect matching colored endpoints with one continuous line, avoid crossing paths, and fill every cell to clear the board.
The goal was to keep the interaction quiet and immediately understandable on both desktop and mobile. The part I’m still testing is onboarding: does the first board teach the rule without extra explanation, especially on a phone?
If you try it, I’d value one specific piece of feedback: at what point, if any, did drawing or correcting a path feel unclear?
Play LINEA: https://shaxinggames.com/games/linea?utm_source=indiehackers&utm_medium=referral&utm_campaign=shaxing_focus_20260907&utm_content=linea_product_update_20260914&utm_term=generic