Enticing ! The thema of the loop is interesting.
The main nechanic puzzles me, I could think of ways to make them more fun;
- the slowed bullets could remain slow, in the current state it doesn't help enough.
- right now the fact you can't help the clouds to position themselves in a good spot makes you a bit of a spectator to this feature.
Why not moving them with right sticks? Or pushing them left and right with your bullets (this could be huge fun).
Nice pixel art and small pixel fxs!