Levels I was able to get 4 stars (i.e. 3+) on: 1-3, 1-8, 1-10, 1-12, 2-3, 2-9, 2-11, 2-12, 2-13, 2-17. Use angles to have shots bounce between blocks to get multiple hits w/one shot.
Could you make the X-axis level more annoying please. It only took me 100 or so excruciating tries to get the final jump to the exit. (Otherwise a great game!)
Finished last level w/no gate pts lost. You don't need everything maxed to win. I had 2 stables, 2 workshops, 3 strongholds, 4 barracks, and all upgrades but Wall 2 and Bodybuild 2.