Super cool. If this were refined, I would pay for it.
On that note, things that could use refining/addition/change IMO:
1) Nested tasks (and have the flashy green particles go off when all nested tasks under a main task are completed).
2) Drag to reorder tasks
3) Ability to select text for replacement (only moving caret is cumbersome)
4) Minimize, close, scroll, task "X" button all don't work. Scrollbar is unconstrained.
5) Ability to archive task once done. Useful for future reference but shouldn't clutter the main view.
The transparent vibe is so cool, and the juice is awesome on the sliding and particles. I see promise!