The enemies look ridiculous, but they come in waves and they do not go down easily. Funny Shooter 2 is a first-person shooter with a sense of humor: you fight odd, cartoonish creatures across levels that get steadily harder, and the rewards from each fight go into better weapons.
Ammo is worth saving, so go for weak points instead of spraying bullets at the whole crowd. Upgrading between levels matters too, since the later fights are noticeably harder. For a classic arena shooter with no jokes at all, Quake 3 Arena is also available here.