Not too shabby! I don't think it necessarily has enough going for it to appeal for that long, but I think it has some solid fundamentals, in a sort of 'good student project' kind of way.
As said, the gameplay does show some promising aspects to it: I like how you are rewarded with more points for making skilled long-range shots. Similarly, hooking those double-sided gem rocks felt so great with the way they clear the entire board. I especially like the subtle touches such as how your score ticks up when you get points instead of just instantly changing: very satisfying! There's also a nice strategy where you want to hook big ones, but you need to think whether its worth the risk as it might entail letting some rocks go and losing precious bridge real estate. It's a simple game, but its decent!
However, I feel like it didn't take too long for me to get bored. For one, the game is rather dry: while the ticking up of the score was nice in terms of making it juicy, I wish there was more feedback on making more difficult shots, like getting a flash or voice clip or nice sound effect or just increasing the font size when hooking a 100 or even better, a 500 pointer. The game was also a bit confusing despite being so simple: I couldn't figure out why I wasn't being rewarded more points or some sort of bonus for hooking gem rocks, especially when the tutorial gave such importance to them: only the double gem rocks yielded any kind of benefit (and a good benefit indeed, though perhaps too overpowered considering how easily you can get so much of them later on).
As said before, this feels like it was put together for a decent little arcade experience: would've loved to see more complexity and progression from this, more levels and hazards and power-ups and all that, but you got the basics down and that's pretty solid.