If someone miss this:
F4 window/full screen
F5 change size of window
F10 pause
H fall on the ground
↓ jump down from platform
It is passible to roll continuously down/up/down/up/
Different than basic defeat picture gives from soldier, doctor (boss), purple plant, red devil, witch, succub (boss), flying sea wasp, spider woman, final boss.
PS: H games should be able to pass with one hand (literally), level of frustation kill all fun!