Here are the problems to game play mechanics that should be fixed:
1. Math problems for every 10 correct should have an extra 1-2 seconds to solve as they scale to harder questions.
2. Snail collection. I got 66 but it was tedious. As the speed increases you need to decrease the spread of the snails. The issue is you can't collect them otherwise to keep the combo going and this is pointless. Or the speed of the snails falling or allow the pail to be upgraded for a larger collection radius.
3. The shooting range and seals are annoying. They move to fast for casual gaming mice and miss clicks ruin a combo. This is no fun. Either slow them down by about 1 second, increase the hit boxes or especially for the targets lower the spread rate as you start into the combos. This one has made me want to quit the game.
4. Fishing is to slow and the spawn for treasure is to rare.