Cube Section (0-14%) - The gameplay is OK, but the huge gap between the blue orb and blue portal could have been filled with some gameplay, and there's barely any warning for the triple spike that pops up. The section is also really blank, the background could be filled up a little.
Ball Section (15-25%) - This section has the same gameplay problems; some orbs have no warnings. Add some indication of what's going to move and what's not. The decoration improved a bunch, the custom background was decent.
UFO/Ship Section (26-32%) - I really like the custom blocks, they look pretty good. Just work on filling up the background and foreground, and your deco should be solid.
Dual Wave Section (33-40%) - This part was pretty fun to play. Movement was a little repetitive, but not too much. The color combinations are kind of contrasting in my opinion, but that's jut my thoughts.
Robot/Ship/Minicube Section (41-50%) - The robot section is underdecorated. I know it's just a transition form, but still it could be filled. As for the ship, the transition into it gives you no warning of what's coming up next. I had no idea I had to hold to survive. Add a warning, or make it automatically transition. Now for the cube part. Again the gameplay was pretty decent, but the background was kind of blank.
Ship/UFO Section (51-60%) - More emptiness in the background and foreground. The gameplay was mostly just going straight.
Ball Section (60-64%) - This part was much better than the first ball section. The orbs didn't move unexpectedly and there were warning's for fakes. Try adding some pulsing objects though, the decoration was a little plain.
Dual Cube Section (65-68%) - Overall very nice gameplay, even though it was short. Please add something to kill the player if they fly into the ceiling though, and again maybe add some pulsing objects.
UFO/Ship Section (69-80%) - The first short UFO part had some OK gameplay. The ship part was again mostly straight flying. Add more decoration too, again it's a little dull.
UFO Section (81-90%) - The gameplay is a little too spammy to get through, maybe try making the sections a little closer to get to or jut use a normal sized UFO instead. The background was blank again.
Cube Section (91-100%) - A few good ol' orbs to end the level. There could be a little more spacing between the orbs, and a few more just block jumps. And I've said this a billion time already, but add some background and foreground deco.
OVERALL:
Gameplay - 6/10 - The gameplay was OK, just try to make the path clear and always add warnings. Also try not to make the gameplay too spammy like in the UFO part specified above. Also, like shockwave said, add a roof to kill the player.
Decoration - 5.5/10 - A lot of the level was blank, but the parts that weren't looks pretty good. Try doing more stuff like the custom blocks and background, add some pulsing/rotating objects to the foreground, and just try to fill your level up.
Sync - 1.7/2 - Mostly synced, a few parts were desynced.
FINAL SCORE - 20/30, Decent
Someone ate my cookie so pls support me