Dino Shooter Pro puts you on an island with dinosaurs and armed enemies, and gives you guns. It's a wave-and-mission shooter: clear the threats in an area, earn money, upgrade your weapons, move to the next.
The dinosaurs are the interesting enemies — they close distance fast and take more damage than the human enemies, so weapon choice actually matters.
Both dinosaurs and armed human enemies. The dinosaurs close distance quickly and absorb more damage, so keeping range and choosing the right weapon matters.
Yes — money from kills buys weapon and gear upgrades between missions, which is what makes later areas survivable.
Yes — it runs in the browser with nothing to install.