Nice entry!
First of all, the game is very pleasing to look at and has a really high level of polish. The only real quibble with the graphics I have is that it was sometimes a little hard to tell when the ball would go past an obstacle or when it would glance off the edge from the small sprites and maybe not-quite-perfect hit boxes. The sound effects and music were great and added to the mood.
Gameplay-wise, this very much feels like a roguelike, despite being minigolf (my team went a similar direction last year with billiards). The power-ups, procedurally generated levels, punishing difficulty are all there. I did end up beating all nine holes on my third try, but I think I got lucky with the extra hits that spawned in level and were offered as power-ups.
Not really sure what could be improved on the concept other than just more variety of maps and power-ups --- but great work for the 7-day time frame.