Some criticism:
1. Explanations for what the objects do and how to use them is good but it's unclear at first where are the example-objects and where are real gameplay objects. Easy fix: decide on some area for ui/tutorials, place all tutorial related info in there and add some semi-transparent background to this area (thus clear separation)
2. Map is confusing at first. Easy fix: different portal pairs should be different colors so if I remember that fishing pond screen had blue portal I immediately know that I need to enter blue portal to reach it.
3. You can't enter the house in pond-screen, but can enter the house in farm-screen. The last one is specifically unintuitive.
4. Goal is unclear from the start of the game until you reach medicine caldron screen. It might be better to put caldron in the first screen.
5. People who are not extremely fast typers gonna hate you:) Just know that it's hard. As a developer I type pretty well but I didn't manage to get a Shark in a few (5-7) tries. That's why I lost (and so will many other people).
6. Unnecessary waiting. Fishing requires waiting in real life, but in the game waiting is just boring (I am about "Looking for fish" for ~6 seconds), especially for hard challenges that you have to restart several times (and #5 - it's hard).