Calling this a solo game jam, when you've got in credits 5 programmers, 3 sound/music creators, 9 artists and 1 producer is a bit misleading.
As a former primary school teacher, I question the game design of an educational game as an info dump and "true/false" statements. I think picking up the runes was fun, and the backgrounds interesting, and that actually teaching about "okay-i, what is this kind of water called and where it is located". Sorting the runes was fun too, and it created a good game for classification. But the true and false statements and the dumps of information felt like a really old way of understanding education?
Have you tested this with kids? What is the planned age group for people to play it? If this was translated into Finnish, I'd ask some primary school teachers I know to test this out, but as it is now, the language as a second language is too hard for the age group I think would be interested about that.
Art is beautiful, especially the 2D art. The low-poly characters do have some animation clipping issues (glacier hat) and the one at the flooded landscape is walking in water (maybe adjust the background drawing a bit). The art has a lot of different styles, and could fit together better, did you have art direction?
Sounds i turned off. The "click" and the interaction sounds sounded like they're from a free library of sounds, and not really designed specifically for this game. Volume controls would be nice too, but really happy about the sounds off button.
The narrative felt thin. This was obviously out more than 4 months ago, and not specifically made for the narrative game awards, but even looking at this as a not-narrative game, it felt like there was no coherent story of what we're doing and who the player is. The cute and colourful and really interesting characters did not really share their backstory or what they have to do with the flooded village. Player fantasy felt weak. Who are we as the player? A kid getting educated by the cute characters?
I am sorry if I sound too harsh :/ I was really excited about the premise of an educational game about water (three things I'm passionate about by themselves), and with the loads of work you've done to create this, I think you'd have really benefited from art direction, setting of tone and story, and game design that elevates true/false questions to actually interesting educational gameplay. It's hard, I know, and I commend you for trying. Maybe this will help in getting people to read the info dumps? But with the elements you've already got, can you think out of a way to make it more gameplay and less quiz?
Cudos for making it a web build. That's really important for the game be possible to play at schools.