Great effort here! I love your art style a lot and I think you had a really great idea for a game. Two pieces of feedback for you:
1. It was a little difficult to find the treasures as the radar ping wasn't quite sensitive enough.
2. The "search" action was a bit too long and the music for it was a bit too loud.
Overall though: fantastic effort on your first game, you should be super proud of the work you put in! I hope you found the experience really fun and you learn a lot for the next one :D