It's a little confusing at first but once it clicks it really clicks. It's a ton of fun trying to fit in enough specials to keep enemies in a loop of being stunned, which isn't easy because the bosses really aren't slouches.
I definitely wish the special enemy blocks had tooltips saying what they do, though, since the main challenge of the game should be strategizing in the limited time you have and not trial and error.
Aside from that, the game's great, and I had a good time!