With update 1.0.1 I added some sort of checkpoints to the "Nightmare" and "VR" levels + other minor fixes!
The button spawning infinite slimes wasn't intended at first, but I kept it as it doesn't really break anything. :P
The second tree can be de-leafed, but it breaks most of the time because of the button right next to it I believe. They use the same "NPC" base in order to display dialogue, among showing particles etc. I will look into if I can get that fixed at some point though.
If else, thank you kindly, the feedback is much appreciated!