I've been a bit intimidated about the length of your comment so I haven't replyed to it for a while, sorry about that :D
I agree that the top end of the maps are probably too difficult, and that simply having less available space is not the best way to tweak difficulty, it's something we're aware of.
There is an automatic failure detection system but it's been overly enthusiastic in the past so I've dialed it back, maybe too much.
Speed controls are a fair point as well.
It's interesting to me that you have struggled with the fynbos boime, maybe it's something we need to look into. With our playtesting, the starting trees are almost always enough to get you most of the way there to completing fynbos. I can also look at tree distribution.
The earlier tier 3 buildings are supposed to introduce the idea of recycling and allow a more gradual understanding for new players (they only have to deal with a few buildings once they reach tier 3). Tier 3 is kind of trivial though so it might be something we look into.
I'm really pleased to hear you found the game so mechanically and visually pleasing. We've really put a lot of time and love into those parts of the game, so hearing that players can see it is awesome.
Thanks so much for your feedback, I hope you continue to enjoy the game and I see you around in future <3