Rule 3:Bombing positioning can be a little annoying (assuming this is intended) but besides that a good level. I would personally make the level a little bit wider so you can add little bit of space on the right side of the level (even if its just like fire there) as it feels a little cramped working on the right side. Not really a big deal though
Your rule 2 level is really tough
what I wouldnt do for an extra walker lol.