Sure I'm curious to see ur game evolution, I'm glad you're happy about it haha
"I think we have to put gradually alpha to the previous runs because when there are too many it's difficult to see the pickups xD"
Haa yeah that's true but also in a way it give the impression you built the plant/grass line by line. It didn't disturbed at all haha
Maybe just an outline around items could do the job and keep the modification really easy for you to implement!
I retried a few times to understand how the humidity/sun impact the plant. Maybe it was not made on purpose but it gives kinda addictive mechanic because each time you can go a little further so you wan to retry etc..