Game looks great so far :D . I love the art style >:) . If you want some suggestions I got some and some are obvious. :3 I will donate soon, probably by next update :0.
=-= Things I would add as a developer =-=
- Custom/Art for health bar
- Armor or Clothes for the character
- Healing items / Throwing Items / Different weapons / Spells (Not all but Just a thought)
- Music (Most obvious) / Sound effects ( Bro can u stop? NO! >:C. Fine)
- Moving Background. Explain: If you move further toward the end the background will move. Example: Since the first stage is like a forest area the background could move to the left while you progress through the level.
- Mini map
- Add more bound to animations
- Player Icon art
- Whenever she is grabbed by an enemy the border around the screen can have a transparent color or shape
- In settings make a FPS button
=-= Things I would edit =-=
- I like the slime so far, a good Idea I thought would be to make it transparent a little (see through), maybe a jump for it too. [ Looks good either way ;) ]
- Sheila is a little floaty, a good edit might be the gravity for Sheila :D
- Add grass around the bottom of the tree or something that shows its in the ground. >:3
Other than that its pretty good and has great potential. :D have fun