Found this little browsergame 'return to sender'. It's basically a bullethell shooter with a neat twist. Use the cursor keys to dodge bullets while a gauge on the right fills up. When the gauge is full, a sort of bullet-time starts. While the gauge depletes, enemies and bullets move in slow-motion. You can tag bullets, those are 'returned to sender' when the gauge is fully depleted and real-time starts again. How many enemies can you kill?
return to senderMy best score so far is 41.