I didn't think there were Algerian participants in the jam and to my second surprise, he is also a GMS users. glad I discovered your work( and I mean this jam's entry and your previous work), very good job!
Now, coming back to you entry, I think the idea fits the theme well, using planting/trees as a sign of progress, while increasing the difficulty to defend them gradually was a good mix, then adding that last skull mechanics that disappear inside the grass was very smart, it adds an extra layer of gameplay where you have to kill the golbin strategically. WELL DONE!
As I try to be honest in my review, I gotta mention to small parts that I think could get improved on:
The first thing that you can make better is the big tutorial page when starting the game, no one plays a game and likes to see so much text. is it best if you explain to the players through the game, and only explain things that aren't elementary (for example the little numbers under the trees with a gold coin by the side, anyone would understand it refers to the price)
The second thing would be to add more juice/feedback/particles/SFXs..etc, especially the solid color background. In this type of cozy chill games, players can get bored easily if you don't give them that sense of accomplishment, satisfaction to hook them ( take a look at Forager, it's the best example)
The game is actually awesome and my criticism is only to push the game to another level, I know it's a jam and you probably ran out of time, else you would have fixed the majority of what I pointed out.
Overall solid 4,5/5, Congratulations on the entry, and best of luck for the jam!
Keep on the good work, I will make sure you get in touch with you on social.