I think I got lucky 'cause I remember some of those levels being insanely hard. XD
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level 19 "straightjacket" is the most unfair and hard IMO. You need to depend on vertical spawns and then stick a flower on the outside of the "tubes".
I made a few hard levels too for the "Prolific" mode. Currently there are 44 random levels that can be selected but I'm about to patch in 16 more in v1.01 this weekend :D
(EDIT: this week of the 28th)