Changes

=== Damage Boosting ===

Damage boosting off of enemies can get you to places you normally wouldn't be able to reach.

=== Hearts ===

Remaining hearts carry over to the next stage. On top of that, they determine how many of a given subweapon can be present on screen at the same time when used (19 hearts or less allow for 1 subweapon on screen, 20 to 29 hearts allow for 2 subweapons, 30 hearts or more allow for 3 subweapons).