The first level (2/22) is really REALLY hard. It felt like half an hour until I gave up. I skipped to second level (4/22) which was child's play. Anyone stuck @ 2/22 I recommend skipping to 4/22, solve that, go back to 2/22 and use your newly gained experience.
BTW: There is a bug. Since I was suck that long at 2/22, I managed to "destroy" the trinomino splitting it in two (once even three) separate parts. You might want to look into it.