It's really funny to think that "Lustre" and "Crystal fusion" landed in the same Gauntlet, especially when the latter has aged so terribly in comparison to the former. I'm sorry I have to admit this, but "Crystal Fusion" is way too cluttered and messy for my own personal liking. It might have been somewhat decent at the time, but now it just looks like a rather clumsy 'fusion' of glow (lots of it, in fact!) and questionable gameplay. It also doesn't help that obstacles feel somewhat obscured by the level's decoration at points. I like the concept that the whole level is escaping from a mine that is flooding with lava, but aside from that, it's a relic of early 2.1 that (in my opinion) hasn't aged too well.

Alright I said I'd review daily levels, but I felt like I had to write one on this level since my comment praising the level got -4 likes :p

This level is really really good (for when it came out), far far far FAR from being one of the worst levels in the gauntlets. The gameplay isn't nearly as bad as the people in the level's comments claim it to be, although I must agree it is more of a 6 star than a 5. It syncs well with the song, which btw is very good, is pretty well indicated and it is just fun overall.
The first and third coins are pretty blind which is never a good thing, but come on it's a 5 star, you might die to it once or twice but you'll quickly know when to click. I'm not saying this isn't a negative, it just isn't that much of a problem in this context, if they weren't blind I'd give the gameplay a 10/10.

The decoration is obviously from an earlier era of 2.1 but I think it just adds to the charm this level has. The crystal cave theme is well executed, there are bunch of small details you might not even notice, like an actual hand showing up to push the minecart in the first part and the gold falling the another cart once you fall onto it. You might think I'm crazy for giving it a 10/10, but I just love it too much to give anything but a 10/10, it's early-2.1 look works to it's advantage, unlike levels like Hypersonic, it is very charming and it is just very well executed!

One of my favourite levels from the pre-2.2 gaunlets

hell yeah let's obstruct the vision of the player with the most generic looking decoration of all time guys aren't i such a genius????

i hate early 2.1 levels like these, probably the worst aged level of all time

Fun storytelling. Not much else to say, though.