v0.02 feels unnatural, I would allow moving after shooting again, maybe after a short delay like 0.2 seconds. my comment about level 8 was before I played any later levels, and after experiencing the rest of the game, I would say timing dependent puzzles are a good addition, as long as they are not too precise.
no moving after shooting is not sufficient to prevent timing puzzles, as you can still move and shoot while blocks are falling. level 18 has 3 solutions currently, 2 of which involve speedy action as the block falls. level 8 can be fixed with a wall above the down-arrow. not sure what solutions were fixed in 17 and 14, but 17 looks uglier now.