Pulsara

How it works: Protect the core for two minutes. Click, tap or press Space to release an expanding pulse. Red triangles damage your three shields; pulses reflect them. Blue squares pass safely through the core but split into fast red fragments when pulsed. Press P or Escape to pause.

Score and best result: You can store three pulses; they recharge in 3.5 seconds on easy, 4.5 on normal and 5 on hard. Reflected reds earn 10 points and can start chains worth up to 50 per hit. Blue squares passing the core earn 5. Hit gold inside the marked ring for 30 points and one pulse; outside gives 5. Survive for 250 points plus 100 per remaining shield. Best scores are saved per difficulty.