It's little short but really have fun.
The really "Bad" point is the text, it's almost not readable.
maybe you can make them bigger, or remove outline than add a background ( message box ) for them.
and there have some point not "Bad" but give me a strange feeling.
- basically, whole game under CRT Shader, but mouse cursor "float" on the screen. is that what you design or just because tech or time problem ?
- why potion ? I don't think "potion" relate to the title "nature", is there some reason under the story ?
- boss move very slippy, even boss stand on flat plane. if this is hint for how to beat the boss, than I suggest remove that and add more slope ( without spake ) on the map .
- is mouse movement need to use in fire and water form ? or some other feature in game ? it's not essential to use mouse in this demo version, wind can simple use movement + one more button to use the ability. move and use a button to save is better than click the flag to save.
and I found a double jump bug (maybe) on wind form,
I can jump again while jumping upward, this made me can jump over some point without wind ability.