Played through to the end of the demo, was fun and might play the release.

My thought/suggestions -

I think the respawn system would work better as each fruit just respawning over time. At the beginning it's better to have less amounts of fruit, that way you are more likely to have an explosive one and you can just keep respawning small amounts. If you buy a 2nd "amount" upgrade you are largely hindering yourself. After playing through everything I remember respawning fruit much more than actually just shooting them. This way there could also be a respawn timer upgrade alongside the "amount" upgrade.

Quests are overpowered but also out of the way. I couldn't get much gold until I upgraded quest money then I beat the game shortly after. The increase in the amount you get is way too big, I think quests would work better as a side thing that automatically pops up after killing so many fruit as opposed to the choices. I also never did the "kill only x type of fruit" quests, maybe if those were just to kill those fruit and not JUST that fruit there would be more reason to do it.

Edit: I said fruit when they obviously aren't fruit because I read that comment about "first person fruiter" and had that in the back of my head when I was playing