You need help in completing 2 stars in hard mode , Upgrade training stage

I only gave the stars because the progress does not save, keeps falling back to level 4, otherwise its a great little game in which you can lose yourself building. Just needs a bit more time in the owen. Thank you

I could play this game forever. One thing though, when the stages get harder in hard mode, I think the level recommendation is too low. Because to be able to get full stars, the enemies are sometimes harder than the recommended level.