I think this game is really good so far but could use some improvements to make it more fun. I have a few suggestions:
1. Free play- make a mode where you just keep fishing day by day without an end (you could make the prices more expensive so it takes longer to get stuff)
2. Real tournaments- the derby isnt really much of a competition against anyone else but against your previous scores. Making real competitions maybe on different lakes with different difficulties would be awesome.
3. Select a fishing spot- When you move it just picks a random spot on the lake, being able to pick where you go would be pretty cool. To add on to that you could make different structures around the lake such as weeds, logs, muck or rocks.
4. Multiplayer- I think being able to play with your friends at the same time and have competitions against each other would be amazing. I know it might be a stretch but I believe people would love this idea.
Just some suggestions, but so far I think this game is great.
ImmortalNoob about Ice Fishing Derby Premium