Wait I'm pretty sure I saw roundabout, that exact level, in the recent tab, not even joking (never considered trying to beat it but now I did since you're asking for feedback)
Roundabout
So I like roundabout, however, you need to enable show path for the level to be predictable around the beginning which may be a problem for people who don't know that option exists. Also roundabout is a TINY bit repetitive (especially with the spike jumps at the start), however it's still kind of fun.
I'd give roundabout about a 7.5/10 which means it's good! Also there is some decoration which is nice. It also makes good use of the path editor in my opinion.
Intertwined
It's ok... The block design at the ship part isn't the best though. I'd recommend you make a default block border around the kind of waffle shaped blocks just to give it a more interesting and nice looking design. If I were to be super honest it's a tiny bit boring though. The wave part is just spammy and kind of boring, but at least you decorated it. Also, in my opinion, near the end of the ship part the square of blue spikes surrounding the random orbs looks kind of off place to me.
Oh by the way, did you know that you can get darker colors with the color trigger thing by placing it inside of the ground, with the deeper underground it is the darker it is? Might be useful in some cases and I didn't know that when making my first two levels.