Update#2

- Cat is now fully functional. (YAY!)

- Added NPC visuals & animation. (except for princess.)

- Added player-hit UI indicating remaining lifes.

- Attempted to fix the browser port issue which mess up shop UI after purchasing an item. (still testing.)

- Shortened the obstacle spawn timer by 0.1 second in ACT2.

- Removed healing apples in ACT3.