Nice game, enjoyed it much. :) Only one painful thing. Weapons that you find before buying should be counted as bought. Getting that red badge is frustrating this way.
Cute and relaxing game. It's only annoying feature is that to continue to next level, i have to grab the mouse again. Could bind SPACE too for that purpose.
Are you talking about 3star ratings system? Loose 3+ hearts to receive 2 stars, loose 2\3 hearts to receive 1 star.