Thank you for playing, and glad you enjoyed!
I will revise after the rating period to make it a little less brutal.
A feather counter is a good idea--I'll definitely implement that.
I'll also update the way the torpedoes work. Originally, you could aim them 180 degrees, but I wasn't quite happy with that, so I scrapped it at the last minute for a simpler system that... also doesn't quite work.
As for that pressure plate, I think it's actually in Level 5. The answer is... perhaps you don't have to hit the plate yourself, with your submarine. Perhaps something can just fall onto it. ;)