Your comments

I would suggest that you completely avoid anything violent. Bombs, lazers, burning, anything that's violent would really ruin Quell for me. The waterdrops dying on spikes is upsetting enough!

I would like to see a mechanic where combining drops gives them new abilities or powers. And splitting combined drops on spikes (or roses) makes the drops single again. I feel like that would be interesting.

Perhaps a way to make the Spirit into a water drop would be cool. Or turn a water drop into a spirit.

And as a suggestion for the next Quell, I would actually ask for fewer new mechanics. But the end of Momento, there were so new mechanics I almost felt a little overwhelmed. Its my only "complaint" about the game. Honestly, with all the new mechanics you introduced, you could have made two Quells. So thanks for giving us so much value for our money, but perhaps one or two less next time.