XPilot.io is a multiplayer space arcade shooter that you can play online in your browser. This version is a demo which lets you play against the computer in a small map. There is a Kickstarter to raise money for customizable maps and more game modes (such as capture the flag, free for all, zombie mode, ...). The game is made by Matt Parker.
Use A and S to turn left and right respectively. Use enter to shoot, and shift to thrust. You can also use the arrow keys to move and Ctrl, Space or X to shoot.