I downloaded since it wouldn't play the WebGL version. I think you came up with a really cool and creative concept. I also loved the use of art assets and the 3D hexagon tiles were really cool visually!
I have some notes. On a PC build, you need to include an escape key so players can quit the game. You can use Application.Quit() and it's really simple to implement. I didn't get any audio coming through when I played so not sure if you ran out of time or the audio just didn't work (it happens). I had fun playing but I had no idea if I ever actually found any crystals or not hahaha
Kudos to you for finishing a game though! And the random generation of hex tiles had to have taken some work because that system worked very well and it made the game more enticing when a random little hex island would pop up all by itself. I just had to go explore the area when that happened! Good work :)