Uchuu Patrol Luluco does have an overarching plot, but it's barely visible through increasingly ludicrous visual gags and callbacks to other Trigger properties, all crammed into tiny seven-minute episodes. It's kind of like if you put Kill la Kill and Tengen Toppa Gurren Lagann into a blender and poured the resulting slurry through an FLCL sieve. In fact, Luluco's embarrassing transformation into a human gun ("Fight for Justice!") recalls nothing so much as FLCL's puberty-adjacent head robots. Both shows touch on themes of first love and growing up, and the struggle of just wanting to be "ordinary" in a world gone mad. But whereas FLCL digs into and subverts these themes, Luluco mostly just plays them for laughs - which is fine, given its ultra-short runtime.
There is little substance in this show, but its irrepressible personality and endless conga line of self-referential material is an enjoyable treat for those who are familiar with Studio Trigger's corpus. Even if you aren't, there's a lot to like here. The visuals are impressive and the plot, when they bother cramming it in, is serviceable. If you've seen and enjoyed Panty & Stocking with Garterbelt, Kill la Kill, TTGL or any of Trigger's previous ONAs, you'll find familiar enjoyment here.
