So, i bought Saira :D

Can someone tell me if there is a level editor?
And if there is one - is it possible to access it using Steam?

The editor can be found here: http://nifflas.lpchip.nl/index.php?topic=2300.0
That sub-forum should have a lot of the info you need to make your own levels.

It should be possible to use it with the steam version too.

The editor is really unsupported. Basically it's the tool I created to design the game with so it's only really created with my needs in mind. Then, due to the fact that level editing is possible I made the tool available for everyone to use, but creating a good level is difficult. I'm really hoping to see some though!

Woo! Nifflas himself!
I love your games man! Well, all of them except FiNCK...