I did the tutorials. I also tried a little bit of the campaign mode. I didn't spend too much time on that since it was mostly levels I played in the tutorial already. I didn't have anyone to test out the multiplayer features.
Spirits
It took me a moment to realize I needed to keep the cursor at the red circle. The tutorial text mentioned the red circle, but you might rephrase the text to make this more clear. Once I figured that out, flying around felt fun.
I didn't understand how to get past the purple laser on the "Deadly Beam" level.
I didn't understand what the point of the "ghost" rocket was. I feel like it had something to do with bypassing the beam, but I didn't figure it out.
Neon Swarm
Brings me back to playing the old-school Lemmings games.
I didn't care for doing the Mosh Pit level. Having to get just the right spot for the swarmers to build the stairs wasn't fun. I think requiring that kind of precision can be frustrating for a more puzzle-focused game like this. The level, Mine Barrier, had a similar issue. Having to redo the level because I didn't start building the stairs in the right place wasn't very engaging.
I was a little confused about the game asking you to place "triggers" at first, but I soon realized a pop-up appears when you click on one of the abilities. Though, maybe you could draw attention to it more so people don't easily miss it.
Serpents + Pilots
I can't really comment on these too much because they seem to be intended for multiplayer and I didn't have anyone to play with. Do you plan on adding single player variants of these? I skimmed through your dev long but didn't notice it mentioned anywhere.
Overall
I think the game, for the most part, does a good job of tutorializing the first two mini-games. Besides the few points I noted above, I found myself learning the games quite easily for the most part.
There seems to be a bug with the name change tab. I wasn't able to type anything in at first. I refreshed the game and was able to get it working. But it might be worth looking into.
The individual games seem to be competently made, though they seem to be mostly clones of older games without much to make them stand out on their own. It would help to add some sort of variation or twist on the games to set them apart from their inspirations.
Overall, nice job on the game and building the online features and such. If there's any content I missed, let me know and I can give the game another try.