Great idea, the core gameplay is fun. I like the game, but I definitely see some elements that could use improvement.
Certain light spots need time adjustments. In some places, you recharge your ammo very quickly, while in others you have to stand there for around 20 seconds. This is problematic because after a battle you’ll most likely have no ammo, and with no enemies around, you just stand there doing nothing while slowly recharging. That gets boring pretty quickly. Regarding the light recharging mechanic as a whole, it incentivizes players to stay in one place, making fights less dynamic. Without ammo, there isn’t much else players can do to defend themselves, so they will always seek the nearest light spot and just stay there.
It would also be great to add more incentives for smashing the stone trolls, such as having them revert to their original form over time. Alternatively, if you want to further penalize players for not disposing of them quickly, you could implement a system similar to the one used in the Mario Bros. or Bubble Bobble series, where enemies become stronger/faster after revival, but maybe with less health. As it stands, once they’re defeated, there’s often no reason to smash them if you simply keep your distance during the battle.