Have a look at some of the games I've made. Most of these are fairly small web-only projects which use HTML5 canvas directly, along with a few using the Phaser game framework.
Dodge obstacles for as long as possible while collecting game-changing power ups. A colourful one-button runner game.
Find the pairs of shapes in the fewest moves possible to win.
A simple roguelike game made for Dec's One Game a Month.
An HTML5 shoot-em-up game - my January entry for One Game a Month. A writeup of the PewPew project is on the blog.
Noughts and Crosses
Pong - hit the ball past your opponent to win points.