Game was pretty fun, though a bit slow at the beginnings and the ends. The skill tree is a nice way to mix things up, though it can be easy to softlock yourself if you don't get gem storm early enough.
Gem storms are one of the more interesting mechanics I've seen, given that they encourage experimentation in a good way as opposed to experimenting without benefits or with losses. There's no one good way to set them up which makes it feel better. The shuffle mechanic is also neat, but it's more discouraging to experimentation because it can ruin your previous setups and introduce new setups that just don't really work (which is a bit of a problem since they take like 1 to 2 minutes to load at endgame when you most need it).
Balancing is a bit off, the start is kind of slow and uninteresting before specializations. Waiting for the last specializations is also kind of slow but at least you have good graphics to entertain you for a few minutes before you just leave it to run in the background.
Theme- I was going to give a 2/5 originally since it didn't felt like time mattered a lot, but I bumped it up a bit after gem storms which make fair use of the mechanic.
Other stuff: shards and magnet effects don't reset on runs which can have some interesting side effects. It also introduces a bit of randomness which is hard to control unfortunately.
Overall amazing game made within the time period, given that it felt so unfinished and obviously a prototype rushed in a day or two just 2 days before the jam end. I'm glad I revisited the concept.