It's quite interesting take on minigolf, I like that you can basically take more risks by speeding up your hit timer so you get more "moves" for the future hits. It's a simple gameplay gimmick but I think it's an effective one. I think that the level designs could be improved, for example putting sand in the level doesn't really do much since you can't do anything else to avoid it, it feels like the sand is there for the sake of being there (ie, without an actual purpose like punishing / rewarding risky play). There also isn't really a reason to hit the ball softly since from my experience I can just blast the ball into the hole and it'd get in, unless if you're really unconfident about timing the hit.
With more polishing I think the game could be interesting! There's a lot of mechanics and level ideas you can do to make the game stand out. Good work!