Cute idea, but the start could have definitely be a bit faster. Possibly starting the bonsai partially grown would have been nicer than staring at an empty screen for a few minutes before you could do anything. Trimming was also really awkward - needing to place the cursor at very specific spots was more difficult than it should have been, and for a while I genuinely thought there might be a bug preventing me from doing anything. The inactive toolbar also just confused things. Maybe you could have just hidden that until they get implemented.
Sometimes the time would just stop for about 30 seconds before moving again so not sure if there was a reason for that or if it’s just a bug. There’s also visible flashing behind the tree as the background colour changes.
I kind of wished it looked a little nicer. Maybe some softer colours, a more interesting background, or some more detail on the tree.