Cool idea to be able to combine the elemental powers!
Slight GUI complaint, the elements look greyed out like they aren't available yet.

Bug?
- if you hold right click, you can spam spells forever without refilling. Not sure if this was intentional?

Core Gameplay complaint:
- the game does not require experimentation to win. You try out a few different combos and then just stick with one. Having different enemies that are only effected by certain combos could be one way to help with this.
- i think the spell spam is a bug as otherwise there is no need to rechoose your elements.

There is other things that could be improved on, but the core gameplay loop is the most important. Hope this helps!

Lots of stuff here, a good start! I think it was released just a bit too soon even for sneak preview.

bugs:
- unfortunately none of the enemies would die although their death animations seemed to trigger.
- In general animations that shouldn't be triggering appeared to be triggering.
- pause menu doesn't work

style:
- that initial menu is very amateurish, especially the font. Unfortunately I think a lot of people will bounce as soon as they see that main menu even though it doesn't have any other impact on the game. Consider changing that.

Nice job! I especially liked the beginning. It had a great atmosphere. I thought you lost it a little by the end, especially the last 30 seconds.

The droning synth in the background is pretty obnoxious. I think its partly the sound and partly the fact that it doesn't vary at all in either the notes or the dynamics. Also the pan flute is pretty cheesy at the end.

I would say that if you were going for a 90's retro game theme then this might be ok.

I really like it, hope you win