Nice work on developing this game! I had a blast while playing this! It's hard to believe that this is only a prototype!
I thought the visuals and graphics were mesmerizing. I adore the pixel art, and the enemy animations were cool too! In addition to that, I had no problems with the controls. Everything was smooth; no lags, no delays.
Lastly, the audio was pretty stellar in my opinion. I hope you continue to develop this game in the foreseeable future. I would advise adding some spells for the player to utilize. For instance, there could be a spell where all the enemies on the field get wiped out in one blow.
Another example could be a shield spell that protects the Tree of Life for a brief time if the player fails to defeat all the incoming enemies. Congratulations on your achievement!