Friends level

Because this is a megacollab, I'll break down each creator's part.

RaioMagikarp's introduction to the level helps keep the nice demon difficulty your friend was going for. The first spike to fly over seems a little cheap and is a bit annoying to die a lot, but other wise it's a nice, challenging gameplay. The design here is also one of the better parts of the level, having the bright neon foreground and intricate spike structures. It would be nice to have color change, especially on that speed change, but this in no way hurts the section's rating. Just a suggestion.
Gameplay: 8/10
Design: 8/10
Sync: NA (sync is hard to measure with the ship, unless there is a certain speed change or orb timings that match particularly well. It would be unfair to judge sync for a gamemode that intrinsically is meant to be filler for a section of the song.)

Detonator's transition into the UFO is inconsistent. The three spike gaps for each jump really throw off the flow of the level and doesn't match the theme of the song well. However, the ball part leading to the drop is very enjoyable and buildup is well timed, especially with the standard demon face and the flashes. Design wise, it's a very standard black block with the standard spikes. The background is also very simple as well, and doesn't change throughout the section (not saying that a good custom background changes frequently, but there is often a little motion to vary the scenery a bit, even if it is slow). There are also few block transitions that help make the section feel more intense, a nice touch on Detonator's part.
Gameplay: 6/10 (first 50% was meh but the last 50% got full marks)
Design: 4/10
Sync: 3/5 (same as the gameplay)

Educmat's part is where most of the difficulty comes from. The initial mini ship into wave into ball is very satisfying, but the mini robot jump over the spike after the triple spike is a bit cheap and where most of my deaths came from playing through this part. The sudden ship transition at 41 is also a bit sudden and an object signifying its placement would be appreciated. The duel section plays well, and the wave part is standard. It's a good difficulty for an easy-medium demon. However, the design feel a bit messy and a little old-fashioned. The background is rather plain (using the gray 1.9 objects) and ends up giving a claustrophobic feel to the eyes. It also has flashes in yellow, which continues to hurt the eyes. The block design is bit varied, which is a plus, but a suggestion I could give to Educmat is to use blocks that are fairly simple if you plan to combine them, and to use different blocks sparingly. The second wave part does a good job at this. The cube and last little UFO sections are done pretty well.
Gameplay: 8.5/10
Design: 6/10
Sync: 3/5 (The speed transitions help with this, but every musical movement should not have a speed transition to sync)

AlphaLinker's initial robot gameplay is decent to match with the song. The wave gameplay is also pretty standard, with a very nice focus on the sync during the duel part. The mini-cube is decent until it slows down, where there are a few awkward (but not terrible) timings. Design-wise, this feels the most rushed. The clouds have a shadowed texture, which is more detailed, but it feels copy-pasted. The block design is not horrible on the robot part, but because the X's in the blocks are at the highest opacity, it's very striking and blocks the rest of the texture in the block. The wave design is very simple and the background a bit of a pain to watch, and the cube part is very empty.
Gameplay: 6/10
Design: 4/10
Sync 4/5 (actually one of the best in this level)

Fusion's ship gameplay is very fun to play, because it's not too difficult but it makes the player feel good while going through the various spike corridors. Its block design is plain and relaxing on the eyes, while still maintaining different textures. The transition to the UFO is well thought out but poorly executed, as one can throw off the sync by hitting different parts of the UFO portal (and the double speed) with the robot. The first duel section at the end with the ship and ball is also well thought out, with the player having to focus only on the ship, but the design feels empty and a little repetitive to the previous ship section. The swing copters are pretty standard, and a fine way to end this level. Design wise, they're also the most colorful and most intricate, with an interesting "broken" texture in a few of the moving obstacles.
Gameplay: 8/10
Design: 8/10
Sync: 3/5

Total:
Gameplay: 36.5/50
Design: 30/50
Sync: 13/20
Grand Total: 79.5/120

Overall, not a terrible level. I personally couldn't see this being featured, but as all of these creators are unknown, it's above average. There are a few flaws in each part, but overall the gameplay was fun, the design was decent, and the sync good enough to warrant me write a detailed review. One thing this level did very well was difficulty scaling: no one part felt much easier than the rest as to make a part annoying or boring.

Polarbeahr

So, this is my first review. Was it decent? I know that there is no video for you to judge my comments, and I had to use a copy hack to play some parts with the music, but how was the quality of the review? I made sync half of the other categories because the judges weigh more on gameplay and design. I didn't judge originality, as I feel that it's too hard to do and I haven't played enough 2.0 levels to be a fair critiquer.