Thanks for kind words! There is actually more content, after beating last wave you'll get challenges and new items unlocked. To be honest I think some decisions might not be the best, for example it takes long for many players to get the idea of ammo management, so maybe it could be better to change weapons automatically after you run out of ammo and build everything around this. Green targets are super problematic hah, confusing many people even after bad sound and X sign.