Hi! Since you commented on my game, I figured I'd come and try yours out as well (even though you didn't really like my game lol but it's all good).
I would say it's a unique idea, but the environments, at least for the first few levels are not too interesting. The water looks fantastic, I'll say that. The swimming is really cool. I also thought it was neat how the water level rises when you drop sticks.
But the scattered plants and landscape are not too interesting. I know you're still looking to upgrade assets and stuff, but for me it's about interactivity, not quality of assets. You have pretty big levels, and most of the things in them the player can ignore. Especially once I got to level 3 where the main challenge is finding resources among the evenly scattered plants. So you could have really limited art and assets, but if the design is good, the game is fun. Like you can literally have N64 level graphics and make a great game. There just needs to be more intention behind the level designs, the terrain, obstacles, where objects are placed, etc.
I think there's kind of a lot going on with the genre of game, too. It's a collect-a-thon, but also kind of a survival game, some dam building, and an education game. A game can have multiple aspects, but you might want to figure out which one of those is the MOST fun as a gameplay loop and just try to do that one thing really well. Making a game solo is a lot of work, so trying to improve ALL of those mechanics as one person can be pretty impossible.
If it's a collecting game. Leading the player through the environment with a trail of resources, maybe even some platforming would be fun. And faster and smoother movement would help. If it's more about survival, I feel like adding some kind of obstacle would help, like you have to succeed in damming up the mouth of a river before it rains, or before the sun goes down. Otherwise it seems like you can wander aimlessly looking for sticks for a very long time with no real obstacle besides happiness slowly sinking. Apologies if something like these suggestions actually happens in a later level I wasn't able to get to.