cool downs are much more common than attack up
there is a secret wing upgrade you lose it when you're attacked
you dont need to destroy orbs to go to the boss
wall climber stops you from sliding away in the snow castle
acid is an instant kill
you only fire bolts when your health is full
you can switch good helmets for bad ones
most of the upgrades dont stack
and great game btw :)
That about sums it up... Thanks! :-D